Yamaha YFM90R (2023) Manual

Yamaha Quad YFM90R (2023)

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YFM90R

OWNER’S MANUAL

MANUEL DU PROPRIÉTAIRE

MANUAL DEL PROPIETARIO

BD3-F8199-67

READ THIS MANUAL CAREFULLY!

It contains important safety information.

LIRE ATTENTIVEMENT CE MANUEL!

Il comprend d’importantes informations de sécurité.

¡LEA ESTE MANUAL ATENTAMENTE!

Contiene indicaciones importantes acerca de la seguridad.

Original instructions

Notice originale

Manual original

PRINTED IN TAIWAN

2022.03 (E,F,S)

READ THIS MANUAL CAREFULLY!

It contains important safety information.

WARNING

OWNER’S MANUAL

YFM90R

This ATV should not be ridden by anyone under 10 years of age.

BD3-F8199-67-E0

EBU40221

Read this manual carefully before operating this vehicle. This manual should stay with this ve-

hicle if it is sold.

Declaration of Conformity

We, YAMAHA MOTOR CO., LTD. 2500 Shingai, Iwata, Japan,

declare in sole responsibility, that the products

Kind of Products: All-terain-vehicle

Model Year: 2023

Type Designation: YFZ50, YFM90R

In accordance with UK Government guidance

(Make, model)

The object of the declaration described above is in conformity with the

relevant UK Statutory Instruments (and their amendments):

2016 No. 1091 The Electromagnetic Compatibility Regulations

Manufacturer:

Signature

Senior General Manager

PF Model Development Section

YAMAHA MOTOR CO., LTD.

Date of Issue

Yuichi Taked a

7, Feb, 2022

Importer:

AEON MOTOR CO., LTD.

74342 No.41, Nanzhou, Shanshang Dist., Tainan City , Taiwan (R.O.C.)

YAMAHA MOTOR EUROPE N.V . BRANCH UK

Units A2 - A3, Kingswey Business Park, Forsyth Road, Woking, Surrey, GU21 5SA, UK

EBU17171

INTRODUCTION

EBU34060

Congratulations on your purchase of the Yamaha YFM90R. This ATV represents the result of many years

of Yamaha experience in the production of fine sporting, touring, and pacesetting racing machines. With

the purchase of this Yamaha, you can now appreciate the high degree of craftsmanship and reliability that

have made Yamaha a leader in these fields.

This manual will provide you with a good basic understanding of the features and operation of this ATV.

This manual includes important safety information. It provides information about special tech-

niques and skills necessary to ride the ATV. It also includes basic maintenance and inspection proce-

dures. If you have any questions regarding the operation or maintenance of your ATV, please consult a

Yamaha dealer.

AN IMPORTANT SAFETY MESSAGE:

Read this manual completely before operating your ATV. Make sure you understand all instructions.

Pay close attention to the warning and notice labels on the ATV.

This ATV should not be operated by a child under 10 years of age.

AN IMPORTANT NOTE TO PARENTS:

This ATV is not a toy. Before you let your child ride this ATV, you should understand the instructions and

warnings in this Owner’s Manual. Then be sure your child understands and will follow them. Children differ

in skills, physical abilities and judgment. Some children may not be able to operate an ATV safely. Parents

should supervise their child’s use of the ATV at all times. Parents should permit continued use only if they

determine that the child has the ability to operate the ATV safely.

Your ATV was delivered with an adjustable speed limiter. Yamaha recommends that all beginners start off

to limit the amount of speed available while they learn. The adjusting screw may be gradually turned out

as the beginner becomes more familiar with operating the ATV. Parents should decide when to adjust the

ATV for more power as their youngster’s riding skills improve. Once the ATV rider can operate with skill at

the top speed permitted by adjusting the vehicle speed limiter alone, the engine speed limiter plate can be

removed. Since removal of this limiter will result in a significant increase in power, turn the vehicle speed

limiter adjusting screw completely back in again; adjust it out in stages as done previously.

If your child is a beginner or is inexperienced, he or she should take a training course.

EBU17331

IMPORTANT MANUAL INFORMATION

EBU17344

FAILURE TO FOLLOW THE WARNINGS CONTAINED IN THIS MANUAL CAN RESULT IN SERIOUS IN-

JURY OR DEATH.

Particularly important information is distinguished in this manual by the following notations:

TIP

Product and specifications are subject to change without notice.

The ATV you have purchased may differ slightly from the figures shown in this manual.

This is the safety alert symbol. It is used to alert you to potential per-

sonal injury hazards. Obey all safety messages that follow this sym-

bol to avoid possible injury or death.

A WARNING indicates a hazardous situation which, if not avoided,

could result in death or serious injury.

A NOTICE indicates special precautions that must be taken to avoid

damage to the vehicle or other property.

A TIP provides key information to make procedures easier or clearer.

WARNING

NOTICE

TIP

EBU17351

IMPORTANT NOTICE

EBU38310

THIS MACHINE IS DESIGNED STRICTLY FOR COMPETITION USE, ONLY ON A CLOSED COURSE.

This ATV is designed and manufactured for use on unpaved surfaces only. It is unsafe to operate this ATV

on any paved surface, paved street, paved road or motorway.

Please check your local riding laws and regulations before operating this ATV.

EBU33790

YFM90R

OWNER’S MANUAL

1st edition, February 2022

Any reprinting or unauthorized use

without the written permission of

Yamaha Motor Co., Ltd.

is expressly prohibited.

Printed in Taiwan.

EBU17421

TABLE OF CONTENTS

VEHICLE IDENTIFICATION ............................ 1-1

Identification numbers ................................1-1

LOCATION OF THE WARNING AND

SPECIFICATION LABELS .............................. 2-1

SAFETY INFORMATION ................................3-1

DESCRIPTION................................................ 4-1

Left view...................................................... 4-1

Right view....................................................4-1

Controls and instruments............................4-2

INSTRUMENT AND CONTROL

FUNCTIONS ................................................... 5-1

Main switch................................................. 5-1

Indicator lights............................................. 5-1

Handlebar switches .................................... 5-2

Throttle lever ............................................... 5-2

Speed limiter ............................................... 5-3

Front brake lever ......................................... 5-5

Rear brake lever .......................................... 5-5

Parking brake.............................................. 5-5

Drive select lever......................................... 5-6

Kickstarter .................................................. 5-7

Fuel tank cap .............................................. 5-8

Fuel ............................................................. 5-9

Fuel cock .................................................. 5-10

Starter (choke) ......................................... 5-12

Seat .......................................................... 5-13

Front shock absorbers ............................. 5-13

Rear shock absorber ................................ 5-15

PRE-OPERATION CHECKS .......................... 6-1

Fuel ............................................................. 6-3

Engine oil .................................................... 6-3

Transmission .............................................. 6-3

Front and rear brakes ................................. 6-3

Throttle lever............................................... 6-3

Drive chain .................................................. 6-3

Tires ............................................................ 6-3

Chassis fasteners ....................................... 6-6

Instruments and switches........................... 6-6

OPERATION .................................................. 7-1

Starting a cold engine................................. 7-1

Starting a warm engine............................... 7-3

Operating the drive select lever and

driving in reverse.......................................7-3

Engine break-in ........................................... 7-4

Parking ........................................................7-5

Parking on a slope ...................................... 7-5

Accessories and loading .............................7-6

RIDING YOUR ATV ........................................ 8-1

GETTING TO KNOW YOUR ATV ................ 8-2

RIDE WITH CARE AND GOOD

JUDGMENT ..............................................8-2

BE CAREFUL WHERE YOU RIDE...............8-9

TURNING YOUR ATV................................ 8-12

CLIMBING UPHILL ...................................8-13

RIDING DOWNHILL .................................. 8-16

CROSSING A SLOPE................................ 8-17

CROSSING THROUGH SHALLOW

WATER....................................................8-18

RIDING OVER ROUGH TERRAIN .............8-20

SLIDING AND SKIDDING..........................8-20

WHAT TO DO IF........................................ 8-21

PERIODIC MAINTENANCE AND

ADJUSTMENT................................................9-1

Owner’s Manual and tool kit .......................9-2

Periodic maintenance chart: Emission

control system ..........................................9-3

Periodic maintenance chart: General

maintenance and lubrication .................... 9-5

Checking the spark plug............................. 9-9

Engine oil .................................................. 9-10

Why Yamalube.......................................... 9-13

Transmission oil........................................ 9-14

Cleaning the air filter element ................... 9-15

Cleaning the spark arrester ...................... 9-18

Adjusting the carburetor ........................... 9-19

Adjusting the engine idling speed ............ 9-19

Adjusting the throttle lever free play......... 9-20

Valve clearance......................................... 9-21

Brakes....................................................... 9-21

Checking the front and rear brake

shoes ...................................................... 9-21

Adjusting the front brake lever free play... 9-23

Adjusting the rear brake lever free play.... 9-24

Drive chain slack....................................... 9-25

Lubricating the drive chain ....................... 9-27

Checking and lubricating the cables ........ 9-28

Checking and lubricating the front and

rear brake levers ..................................... 9-28

Checking the wheel hub bearings ............ 9-29

Lubricating the front arm pivots ............... 9-29

Lubricating the front knuckle pivots ......... 9-30

Lubricating the steering shaft ................... 9-30

Battery ...................................................... 9-31

Replacing the fuse .................................... 9-34

Removing a wheel..................................... 9-34

Installing a wheel....................................... 9-35

Troubleshooting ........................................ 9-36

Troubleshooting chart ............................... 9-37

CLEANING AND STORAGE .........................10-1

Cleaning .................................................... 10-1

Storage...................................................... 10-2

SPECIFICATIONS ........................................ 11-1

INDEX........................................................... 12-1

1-1

EBU38860

VEHICLE IDENTIFICATION

EBU28205

Identification numbers

Record the vehicle identification number and

model label information in the spaces provided

below.

VEHICLE IDENTIFICATION NUMBER:

MODEL LABEL INFORMATION:

EBU26032

Vehicle identification number

The vehicle identification number is stamped into

the frame. This 17-digit number is used to identify

your individual ATV.

EBU26053

Model label

The model label is affixed at the location shown.

1. Vehicle identification number

1-2

Your specific model can be identified by checking

the model type code found on the model label.

1. Model label

1. Model type code

2. Production code

3. Color code

**** - * * *

2-1

EBU29681

LOCATION OF THE WARNING AND SPECIFICATION LABELS

EBU36153

Read and understand all of the labels on your ATV. These labels contain important information for safe and

proper operation.

Never remove any labels from your ATV. If a label becomes difficult to read or comes off, request a re-

placement label from your Yamaha dealer.

1 5 6 72 43

2-2

BD3-F816R-20

BD3-F816L-50

E10E5

BW4-F817K-10

2-3

BD3-F816P-50

25 kPa

0.25 kgf/cm²

3.6 psi

25 kPa

0.25 kgf/cm²

3.6 psi

B8W-F816M-M0

YAMAHA MOTOR CO., LTD.

2500 Shingai, Iwata, Shizuoka, JAPAN

YAMAHA

BW4-F155A-20

2-4

Familiarize yourself with the following pictograms and read the explanatory text, then make sure to check

the pictograms that apply to your model.

Read the Owner’s manual.

ALWAYS use an approved helmet and

protective gear.

Use from 16 years old.

Operating this ATV if you are under the age

of 16 increases your chance of severe injury

or death.

Use from 6 years old.

Operating this ATV if you are under the age

of 6 increases your chance of severe injury

or death.

Adult supervision required for children under

age 16.

Use from 10 years old.

Operating this ATV if you are under the age

of 10 increases your chance of severe injury

or death.

Adult supervision required for children under

age 16.

NEVER use on paved roads.

NEVER carry passengers.

NEVER use with drugs or alcohol.

2-5

E10

**.* kPa

*.** kgf/cm²

*.* psi

**.* kPa

*.** kgf/cm²

*.* psi

This unit contains high-pressure nitrogen

gas.

Mishandling can cause an explosion. Do not

incinerate, puncture or open.

EN228 fuel identification mark.

Gasoline of ethanol 10% or less can be

used.

EN228 fuel identification mark.

Gasoline of ethanol 5% or less can be used.

Use unleaded gasoline only.

Measure the tire pressure when the tires are

cold.

Adjust the tire pressure.

Improper tire pressure can cause loss of

control.

Loss of control can result in severe injury or

death.

3-2

Never operate at speeds too fast for your skills

or the riding conditions. Always go at a speed

that is proper for the terrain, visibility, operating

conditions, and your experience.

Never attempt wheelies, jumps, or other stunts.

Always inspect your ATV each time you use it to

make sure it is in safe operating condition. Al-

ways follow the inspection and maintenance

procedures and schedules described in this

manual.

Always keep both hands on the handlebars and

both feet on the footboards of the ATV during

operation.

Always go slowly and be extra careful when op-

erating on unfamiliar terrain. Always be alert to

changing terrain conditions when operating the

ATV.

Never operate on excessively rough, slippery or

loose terrain until you have learned and prac-

ticed the skills necessary to control the ATV on

such terrain. Always be especially cautious on

these kinds of terrain.

Always follow proper procedures for turning as

described in this manual. Practice turning at low

speeds before attempting to turn at faster

speeds and never turn at excessive speeds.

Never operate the ATV on hills too steep for the

ATV or for your abilities. Practice on smaller hills

before attempting larger hills.

Always follow proper procedures for climbing

hills as described in this manual. Check the ter-

rain carefully before you start up any hill. Never

climb hills with excessively slippery or loose

surfaces. Shift your weight forward. Never open

the throttle suddenly or make sudden gear

changes. Never go over the top of a hill at high

speed.

Always follow proper procedures for going

down hills and for braking on hills as described

in this manual. Check the terrain carefully before

you start down any hill. Shift your weight back-

ward. Never go down a hill at high speed. Avoid

going down a hill at an angle that would cause

the vehicle to lean sharply to one side. Go

straight down the hill where possible.

Always follow proper procedures for crossing

the side of a hill as described in this manual.

Avoid hills with excessively slippery or loose

surfaces. Shift your weight to the uphill side of

the ATV. Never attempt to turn the ATV around

on any hill until you have mastered the turning

3-3

technique described in this manual on level

ground. Avoid crossing the side of a steep hill if

possible.

Always use proper procedures if you stall or roll

backwards when climbing a hill. To avoid stall-

ing, use the proper gear and maintain a steady

speed when climbing a hill. If you stall or roll

backwards, follow the special procedure for

braking described in this manual. Dismount on

the uphill side or to a side if pointed straight up-

hill. Turn the ATV around and remount, following

the procedure described in this manual.

Always check for obstacles before operating in

a new area.

Never attempt to operate over large obstacles,

such as large rocks or fallen trees. Always follow

proper procedures when operating over obsta-

cles as described in this manual.

Always be careful when skidding or sliding.

Learn to safely control skidding or sliding by

practicing at low speeds and on level, smooth

terrain. On extremely slippery surfaces, such as

ice, go slowly and be very cautious in order to

reduce the chance of skidding or sliding out of

control.

Never operate an ATV in fast flowing water or in

water deeper than that recommended in this

manual. Remember that wet brakes may have

reduced stopping ability. Test your brakes after

leaving water. If necessary, apply them several

times to let friction dry out the linings.

Always be sure there are no obstacles or people

behind you when you operate in reverse. When

it is safe to proceed in reverse, go slowly.

Always use the size and type of tires specified in

this manual.

Always maintain proper tire pressure as de-

scribed in this manual.

Never exceed the stated load capacity for an

ATV. Cargo should be properly distributed and

securely attached. Reduce speed and follow in-

structions in this manual for carrying cargo or

pulling a trailer. Allow greater distance for brak-

ing.

Do not operate your ATV during darkness un-

less it is equipped with a properly functioning

headlight. Off-road riding is inherently danger-

ous and additionally, off-road trails do not have

streetlights to guide you.

3-4

Never maintain an ATV without proper knowl-

edge. Contact an authorized ATV dealer to in-

form you on basic ATV maintenance. Certain

maintenance can only be carried out by certified

staff.

In the event of an accident

1. If serious injuries are incurred, you may be

safer staying next to your vehicle; it may

shield you from oncoming riders. Depending

on your injuries and position in the trail; you

must make a judgment call as to whether you

should move to a position off the trail. If you

have sustained head, neck, or back injuries,

or cannot feel your limbs, you should not

move. Keep your helmet on and remain mo-

tionless. Lie down next to your vehicle and

wait for help.

2. If less serious injuries are incurred and you

can walk, then move to a position off the trail.

Check yourself for injuries and apply first aid

as needed.

3. If your injuries are light, when safe to do so,

move your vehicle off the trail to avoid colli-

sions with oncoming riders. Check for injuries

and apply first aid as necessary. If you can

physically operate your vehicle, inspect your

vehicle. If the vehicle is in safe operating con-

dition and you can safely operate it, restart it

and ride gently back to camp or other known

location where you can receive medical at-

tention. If necessary, contact your riding party

or local authorities to let them know where

you are and what has happened.

In the event of a breakdown

1. If your vehicle will not restart or is not in safe

operating condition, turn off the main switch

and engine stop switch. If the breakdown oc-

curs at twilight or night, leave the main switch

on so that your lights may warn other riders of

your stopped vehicle.

2. Get out of danger. Check for oncoming vehi-

cles and when safe, push your vehicle to the

side of the trail or even off the main trail to

avoid any possible collisions with oncoming

riders. If you cannot move your vehicle by

yourself, when safe, walk to the nearest van-

tage point and signal an oncoming rider to

help you push your vehicle to a safe place off

the trail.

3. Inspect your vehicle for any immediate haz-

ardous conditions. The most obvious hazard-

ous conditions are leaking fuel and

3-5

ungrounded or broken wiring. Visually check

for broken wiring and leaking fuel. Leaking

fuel can be confirmed by the odor of gasoline.

4. Once immediate safety hazards are con-

firmed not to exist, you may remove your hel-

met to more closely inspect your vehicle.

Check for external signs of wear, broken

parts, fluid leaks, cracks in the frame, sus-

pension damage, wheel damage, and so on.

Fuel, oil, and coolant usually give off a notice-

able odor.

5. If your vehicle will not restart or if it is unsafe

to ride, then turn off all vehicle systems (en-

gine stop switch, main switch, and fuel cock),

and then signal or go for help.

Towing the vehicle

This vehicle is not designed to be towed.

The transmission is properly lubricated only

when the engine is running. Prolonged towing

will damage the transmission as it is not being

lubricated.

Should you need to be towed or winched out,

keep the speed under 16 km/h (10 mph) and

keep the distance as short as possible.

Aftermarket Parts, Accessories, and Modifica-

tions

While you may find aftermarket products similar in

design and quality to genuine Yamaha accesso-

ries, recognize that some aftermarket accessories

or modifications are not suitable because of po-

tential safety hazards to you or others. Installing

aftermarket products or having other modifica-

tions performed to your vehicle that change any of

the vehicle’s design or operation characteristics

can put you and others at greater risk of serious

injury or death. You are responsible for injuries re-

lated to changes in the vehicle. Keep the following

guidelines in mind, as well as those found in the

Loading section (page 7-7) when mounting acces-

sories.

Never install accessories that would impair the

performance of your ATV. Carefully inspect the

accessory before using it to make sure that it

does not in any way reduce ground clearance,

limit suspension travel, steering travel or control

operation.

Accessories fitted to the ATV can create insta-

bility due to improper weight distribution.

Bulky or large accessories may seriously affect

the stability of the ATV.

3-6

Certain accessories can displace the operator

from his or her normal riding position. This im-

proper position limits the freedom of movement

of the operator and may limit control ability,

therefore, such accessories are not recom-

mended.

Use caution when adding electrical accesso-

ries. If electrical accessories exceed the capac-

ity of the ATV’s electrical system, an electric

failure could result, which could cause a dan-

gerous loss of lights or engine power. Also, the

battery tends to discharge more quickly if elec-

trical accessories are added.

WARNING

EWB00073

Avoid Carbon Monoxide Poisoning

All engine exhaust contains carbon monoxide,

a deadly gas. Breathing carbon monoxide can

cause headaches, dizziness, drowsiness, nau-

sea, confusion, and eventually death.

Carbon Monoxide is a colorless, odorless,

tasteless gas which may be present even if you

do not see or smell any engine exhaust. Deadly

levels of carbon monoxide can collect rapidly

and you can quickly be overcome and unable

to save yourself. Also, deadly levels of carbon

monoxide can linger for hours or days in en-

closed or poorly ventilated areas. If you experi-

ence any symptoms of carbon monoxide

poisoning, leave the area immediately, get

fresh air, and SEEK MEDICAL TREATMENT.



 Do not run engine indoors. Even if you try to

ventilate engine exhaust with fans or open

windows and doors, carbon monoxide can

rapidly reach dangerous levels.



 Do not run engine in poorly ventilated or par-

tially enclosed areas such as barns, garages,

or carports.



 Do not run engine outdoors where engine

exhaust can be drawn into a building through

openings such as windows and doors.

WARNING

EWB02592

When transporting the ATV in another vehicle,

be sure it is kept upright and that the fuel cock

is in the “OFF” position. Otherwise, fuel may

leak out of the carburetor or fuel tank.

3-7

4-1

EBU17681

DESCRIPTION

EBU17691

Left view

EBU17701

Right view

1. Fuel tank cap

2. Fuel cock

3. Air filter

4. Fuse

5. Battery

6. Rear shock absorber

7. Kickstarter lever cap

1 2 3 4,5

7 6

1. Spark arrester

2. Reflector

3. Tool kit

4. Front shock absorber

5. Spark plug

6. Engine oil filler cap

7. Transmission oil filler cap

1 2 3 4

7 6 5

4-2

EBU17715

Controls and instruments

1. Rear brake lever

2. Handlebar switches

3. Parking brake lock plate

4. Starter (choke) lever

5. Main switch

6. Throttle lever

7. Front brake lever

8. Drive select lever

1 2 3 5 6 74

5-1

EBU17739

INSTRUMENT AND CONTROL FUNCTIONS

EBU33850

Main switch

The positions of the main switch are as follows:

All electrical systems are supplied with power, and

the engine can be started. The key cannot be re-

moved.

OFF

All electrical systems are off. The key can be re-

moved.

EBU17794

Indicator lights

EBU17861

Neutral indicator light “ ”

This indicator light comes on when the transmis-

sion is in the neutral position.

EBU17831

Reverse indicator light “ ”

This indicator light comes on when the transmis-

sion is in the reverse position.

ONOFF

1. Reverse indicator light “R”

2. Neutral indicator light “N”

1 2

5-2

EBU18068

Handlebar switches

EBU18081

Engine stop switch “ / ”

Set this switch to “ ” before starting the engine.

The engine stop switch controls the ignition and

stops the engine when it is running. Use this

switch to stop the engine in an emergency situa-

tion. The engine will not start or run when this

switch is set to “ ”.

EBU18102

Start switch “ ”

Push this switch to crank the engine with the start-

er. See the starting instructions on page 7-1 prior

to starting the engine.

EBU18286

Throttle lever

Push the throttle lever to increase engine speed.

Spring tension returns the lever to the rest position

when released. Always check that the throttle le-

ver returns normally before starting the engine.

1. Engine stop switch “ / ”

2. Start switch “ ”

1. Throttle lever

5-3

EBU33802

Speed limiter

Your ATV was delivered with two speed limiter de-

vices. A vehicle speed limiter adjusting screw and

a removable engine speed limiter plate. Yamaha

recommends that all beginning riders start off with

the vehicle speed limiter adjusting screw fully

turned in and the engine speed limiter plate in-

stalled to limit the amount of speed available while

they learn.

The vehicle speed limiter keeps the throttle from

fully opening, even when the throttle lever is

pushed to the maximum. The adjusting screw may

be gradually turned out as the beginner becomes

more familiar with operating the ATV. Parents

should decide when to adjust the ATV for more

power as their youngster’s riding skills improve.

Once the ATV rider can operate with skill at the top

speed permitted by adjusting the vehicle speed

limiter alone, the engine speed limiter plate can be

removed. Since removal of this plate will result in

a significant increase in power, turn the vehicle

speed limiter adjusting screw completely back in

again and adjust it out in stages as done previous-

ly.

Vehicle speed limiter

1. Loosen the locknut.

2. To increase the maximum engine power

available and the maximum speed of the ATV,

turn the adjusting screw in direction (a). To

decrease the maximum engine power avail-

able and the maximum speed of the ATV, turn

the adjusting screw in direction (b). Do not

turn the adjusting screw out more than 14.5

mm (0.57 in) or the throttle cable could be

damaged. Always make sure the throttle lever

free play is adjusted to 1.5–4.0 mm (0.06–

0.16 in). (See page 9-20.) WARNING! Im-

proper adjustment of the speed limiter and

throttle could cause throttle cable damage

or improper throttle operation. You could

lose control, resulting in an accident.

[EWB00242]

5-4

3. Tighten the locknut.

Engine speed limiter plate

When the engine speed limiter plate is installed,

engine speed is limited to 4900 r/min. When this

plate is removed, top engine speed (8500 r/min) is

available.

Remove the plate as follows.

1. Remove the seat. (See page 5-13.)

2. Loosen the screws, and then remove the

plate as shown.

3. Tighten the screws.

4. Install the seat.

TIP

Store the engine speed limiter plate with the Own-

er’s Manual so that it is readily available whenever

you want to reduce top engine speed.

1. Locknut

2. Adjusting screw

3. No more than 14.5 mm (0.57 in)

(b)

(a)

1. Screw

2. Engine speed limiter plate

1 2

5-5

EBU18393

Front brake lever

The front brake lever is located on the right han-

dlebar. To apply the front brake, pull the brake le-

ver toward the handlebar grip.

EBU18403

Rear brake lever

The rear brake lever is located on the left handle-

bar. To apply the rear brake, pull the brake lever

toward the handlebar grip.

EBU18462

Parking brake

Use the parking brake before starting the engine

or after parking the ATV, especially on a slope. Ap-

ply the rear brake lever and push down the lock

plate to apply the parking brake. Squeeze the rear

brake lever to release the parking brake.

1. Front brake lever

1. Rear brake lever

5-6

WARNING

EWB00221



 Always set the parking brake before starting

the engine. The ATV could start moving un-

expectedly if the parking brake is not ap-

plied. This could cause loss of control or a

collision.



 Always be sure you have released the park-

ing brake before you begin to ride. The brake

could overheat if you ride the ATV without re-

leasing the parking brake. You could lose

braking performance which could cause an

accident. You could also wear out the brakes

prematurely.

EBU18583

Drive select lever

The drive select lever is used to shift the transmis-

sion into the forward, neutral and reverse posi-

tions. See page 7-3 for drive select lever

operation.

1. Parking brake lock plate

1. Drive select lever

5-7

EBU33893

Kickstarter

Use the kickstarter to start the engine when the

battery voltage is low.

1. Remove the seat (page 5-13), and then re-

move the kickstarter lever.

2. Remove the kickstarter lever cap.

3. Install the kickstarter lever.

4. Move the kickstarter lever down lightly with

your foot until the gears engage, and then

push it down smoothly but forcefully.

1. Kickstarter lever

1. Kickstarter lever cap

5-8

5. When the engine has started, remove the

kickstarter lever and store it under the seat.

6. Install the kickstarter lever cap and the seat.

NOTICE

ECB02300

Do not use the kickstarter if the battery is not

installed or if the battery leads are not connect-

ed.

EBU37980

Fuel tank cap

Remove the fuel tank cap by turning it counter-

clockwise.

WARNING

EWB02522

Gasoline and gasoline vapors are extremely

flammable. To avoid fires and explosions and

to reduce the risk of injury when refueling, fol-

low these instructions.

1. Before refueling, turn off the engine and be

sure that no one is sitting on the vehicle. Nev-

er refuel while smoking, or while in the vicinity

1. Fold out.

2. Push down.

1. Fuel tank cap

5-9

of sparks, open flames, or other sources of

ignition such as the pilot lights of water heat-

ers and clothes dryers.

2. Do not overfill the fuel tank. When refueling,

be sure to insert the pump nozzle into the fuel

tank filler hole. Stop filling when the fuel

reaches the bottom of the filler tube. Because

fuel expands when it heats up, heat from the

engine or the sun can cause fuel to spill out of

the fuel tank.

3. Wipe up any spilled fuel immediately.

NOTICE: Immediately wipe off spilled fuel

with a clean, dry, soft cloth, since fuel may

deteriorate painted surfaces or plastic

parts. [ECB00982]

4. Turn the fuel tank cap fully clockwise to make

sure it is securely closed.

EBU38650

Fuel

Make sure there is sufficient gasoline in the tank

before starting off. Refuel if necessary.

WARNING

EWB02532

Gasoline is poisonous and can cause injury or

death. Handle gasoline with care. Never siphon

gasoline by mouth. If you should swallow some

gasoline or inhale a lot of gasoline vapor, or get

some gasoline in your eyes, see your doctor

immediately. If gasoline spills on your skin,

wash with soap and water. If gasoline spills on

your clothing, change your clothes.

1. Maximum fuel level

2. Fuel tank filler tube

1 2

5-10

TIP

Confirm the gasoline pump nozzle has the same

fuel identification mark.

About the recommended fuel

This model’s engine has been designed to use

regular unleaded gasoline. The research octane

number should be 95 or higher. If knocking or

pinging occurs, try a gasoline of a different brand

or higher octane.

TIP

Gasoline containing ethanol can be used if the

ethanol content does not exceed 10% (E10). Gas-

oline containing methanol is not recommended

because it can cause damage to the fuel system

or vehicle performance problems.

NOTICE

ECB00071

Use only unleaded gasoline. The use of leaded

gasoline will cause severe damage to internal

engine parts, such as the valves and piston

rings, as well as to the exhaust system.

EBU18821

Fuel cock

The fuel cock supplies fuel from the tank to the

carburetor while also filtering it.

The fuel cock lever positions are explained as fol-

lows and shown in the illustrations.

Recommended fuel:

Regular unleaded gasoline (Gasohol [E10]

acceptable)

Fuel tank capacity:

6.6 L (1.7 US gal, 1.5 Imp.gal)

Fuel reserve amount:

0.9 L (0.24 US gal, 0.20 Imp.gal)

1. EN228 fuel identification mark

E5 E10

5-11

OFF

With the fuel cock lever in this position, fuel will not

flow. Always turn the fuel cock lever to this posi-

tion when the engine is not running.

With the fuel cock lever in this position, fuel flows

to the carburetor. Turn the fuel cock lever to this

position when starting the engine and riding.

1. Arrow mark positioned over “OFF”

1. Arrow mark positioned over “ON”

5-12

RES

This indicates reserve. With the fuel cock lever in

this position, the fuel reserve is made available.

Turn the fuel cock lever to this position if you run

out of fuel while riding. When this occurs, refuel as

soon as possible and be sure to turn the fuel cock

lever back to “ON”!

EBU18852

Starter (choke) “ ”

Starting a cold engine requires a richer air-fuel

mixture. This mixture is controlled by the starter

(choke) system.

To use the starter (choke) and enrich the air-fuel

ratio, move the starter (choke) lever in direction (a).

To decrease the starter (choke) or turn it off, move

the starter (choke) lever in direction (b).

TIP

See page 7-1 for engine starting instructions.

1. Arrow mark positioned over “RES”

1. Starter (choke) lever

(a) (b)

5-13

EBU34551

Seat

To remove the seat

Push down on the rear of the seat and pull the seat

lock lever upward to release the seat lock. Then

pull up at the rear of the seat to remove it.

To install the seat

Insert the projection on the front of the seat into

the seat holder, and then push down on the seat

at the rear to lock it in place. Make sure that the

seat is securely fitted.

EBU18997

Front shock absorbers

The spring preload can be adjusted to suit the rid-

er’s weight and the riding conditions.

1. Seat

2. Seat lock lever

1. Projection

2. Seat holder

5-14

WARNING

EWB00401

Always adjust the shock absorber assemblies

on the left and right side to the same setting.

Uneven adjustment can cause poor handling

and loss of stability, which could lead to an ac-

cident.

NOTICE

ECB01091

Never turn the adjusting mechanism beyond

the minimum and maximum settings.

Adjust the spring preload as follows.

Turn the spring preload adjusting ring in direction

(a) to increase the spring preload and thereby

harden the suspension, and in direction (b) to de-

crease the spring preload and thereby soften the

suspension.

Align the appropriate notch in the adjusting ring

with the position indicator on the shock absorber.

TIP

A special wrench can be obtained at a Yamaha

dealer to make this adjustment.

1. Spring preload adjusting ring

2. Position indicator

12345

(a) (b)

5-15

EBU19027

Rear shock absorber

The spring preload can be adjusted to suit the rid-

er’s weight and the riding conditions.

NOTICE

ECB01091

Never turn the adjusting mechanism beyond

the minimum and maximum settings.

Adjust the spring preload as follows.

Turn the spring preload adjusting ring in direction

(a) to increase the spring preload and thereby

harden the suspension, and in direction (b) to de-

crease the spring preload and thereby soften the

suspension.

1. Special wrench

Spring preload setting:

Minimum (soft):

Standard:

Maximum (hard):

1. Spring preload adjusting ring

2. Position indicator

12345

(a)

(b)

5-16

TIP

A special wrench can be obtained at a Yamaha

dealer to make this adjustment.

1. Special wrench

Spring preload setting:

Minimum (soft):

Standard:

Maximum (hard):

6-1

EBU19203

PRE-OPERATION CHECKS

EBU19227

Inspect your vehicle each time you use it to make sure the vehicle is in safe operating condition. Always

follow the inspection and maintenance procedures and schedules described in the Owner’s Manual.

WARNING

EWB00482

Failure to inspect or maintain the vehicle properly increases the possibility of an accident or equip-

ment damage. Do not operate the vehicle if you find any problem. If a problem cannot be corrected

by the procedures provided in this manual, have the vehicle inspected by a Yamaha dealer.

Before using this vehicle, check the following points:

ITEM ROUTINE PAGE

Fuel

• Check fuel level in fuel tank, and add recommended fuel if neces-

sary.

• Check fuel line for leakage. Correct if necessary.

5-9, 6-3

Engine oil

• Check oil level in engine, and add recommended oil to specified

level if necessary.

• Check ATV for oil leakage. Correct if necessary.

6-3, 9-10

Transmission • Check transmission case for leakage. 6-3, 9-14

Front brake

• Check operation, and correct if necessary.

• Lubricate cable if necessary.

• Check lever free play, and adjust if necessary.

6-3, 9-21, 9-23

Rear brake

• Check operation, and correct if necessary.

• Lubricate cable if necessary.

• Check lever free play, and adjust if necessary.

6-3, 9-21, 9-24

6-2

Throttle lever

• Make sure that operation is smooth. Lubricate cable and lever

housing if necessary.

• Check lever free play, and adjust if necessary.

6-3, 9-20

Control cables • Make sure that operation is smooth. Lubricate if necessary. 9-28

Drive chain • Check chain slack, and adjust if necessary.

• Check chain condition. Lubricate if necessary. 6-3, 9-25, 9-27

Wheels and tires

• Check wheel condition, and replace if damaged.

• Check tire condition and tread depth. Replace if necessary.

• Check air pressure. Correct if necessary.

6-3

Brake levers • Make sure that operation is smooth. Lubricate lever pivoting points

if necessary. 9-28

Chassis fasteners • Make sure that all nuts, bolts and screws are properly tightened. 6-6

Instruments and switches • Check operation, and correct if necessary. 6-6

ITEM ROUTINE PAGE

6-3

EBU38000

Fuel

Make sure there is sufficient gasoline in the tank

before starting off. Refuel if necessary. (See page

5-9.)

EBU19561

Engine oil

Make sure that the engine oil is at the specified

level. Add oil as necessary. (See page 9-10.)

EBU38541

Transmission

Make sure there is no oil leaking from the trans-

mission case.

EBU19653

Front and rear brakes

Brake levers

Check for correct free play in the brake levers. If

the free play is incorrect, adjust it. (See pages

9-23 and 9-24.)

Check operation of the levers. They should

move smoothly and there should be a firm feel-

ing when the brake is applied. If not, have the

ATV checked by a Yamaha dealer.

Brake operation

Test the brakes at slow speed after starting out to

make sure they are working properly. If the brakes

do not provide proper braking performance,

check the brake shoes for wear. (See page 9-21.)

EBU19762

Throttle lever

Check the operation of the throttle lever. It must

open smoothly and spring back to the idle position

when released. Have a Yamaha dealer correct if

necessary.

EBU19771

Drive chain

Check the condition of the drive chain and check

the drive chain slack. Lubricate and adjust the

drive chain as necessary. (See page 9-25.)

EBU1979A

Tires

Check tire pressure regularly to make sure it is at

the recommended specifications. Also check for

wear and damage.

6-5

Tire information

This ATV is equipped with tubeless tires and tire

air valves. After extensive tests, only the tires list-

ed below are approved for this model by Yamaha.

Aftermarket tires and rims

The tires and rims that came with your ATV were

designed to match the performance capabilities

and to provide the best combination of handling,

braking, and comfort. Other tires, rims, sizes, and

combinations may not be appropriate.

WARNING

EWB02552

Use of improper tires on this ATV may cause

loss of control, increasing your risk of an acci-

dent.

1. Tire tread depth

Front:

Manufacturer/model:

DURO/DI2017

Size:

AT18 x 7-8

Rear:

Manufacturer/model:

DURO/DI2016

Size:

AT18 x 9-8

7-1

EBU19882

OPERATION

EBU19902

Read the Owner’s Manual carefully before riding

the ATV. If there is a control or function you do not

understand, ask your Yamaha dealer.

WARNING

EWB00632

Read the Owner’s Manual carefully to become

familiar with all controls in order to help pre-

vent any loss of control, which could cause an

accident or injury.

EBU33822

Starting a cold engine

NOTICE

ECB00151

See the “Engine break-in” section on page 7-4

prior to operating the engine for the first time.

1. Set the parking brake. (The engine can be

started only when the rear brake lever is ap-

plied.)

2. Turn the fuel cock to “ON”.

3. Turn the key to “ON” and set the engine stop

switch to “ ”.

4. Shift the drive select lever into the neutral po-

sition. (The neutral indicator light should

come on.)

5. Position the starter (choke) lever according to

the ambient temperature.

Position (1):

Cold engine start with ambient temperature

below 5 °C (40 °F).

Position (2):

Cold engine start with ambient temperature

between 0 °C (30 °F) and 30 °C (90 °F).

Position (3):

Cold engine start with ambient temperature

above 25 °C (80 °F).

7-2

Ambient temp./starter (choke) position

6. Release the throttle lever and start the engine

by pushing the start switch.

TIP

 If the engine fails to start, release the start

switch, then push it again. Pause a few seconds

before the next attempt. Each cranking should

be as short as possible to preserve battery en-

ergy. Do not crank the engine more than 10 sec-

onds on each attempt.

 If the engine fails to start using the start switch,

try using the kickstarter. (See page 5-7.)

7. If the engine is started with the starter (choke)

lever in position (1), move the lever to position

(2) to warm up the engine. If the engine is

started with the starter (choke) lever in posi-

tion (2), keep the lever in this position to warm

up the engine.

8. Continue warming up the engine until it idles

smoothly, then return the starter (choke) lever

to position (3) before riding.

TIP

The engine is warm when it responds quickly to

the throttle with the starter (choke) turned off.

9. Release the parking brake.

NOTICE

ECB00164

For maximum engine life, never accelerate

hard when the engine is cold!

1. Fully open

2. Half open

3. Closed

4. Starter (choke) lever

(1) (3)

(2)

7-3

EBU20292

Starting a warm engine

Follow the same procedure as for starting a cold

engine, with the exception that the starter (choke)

is not required when the engine is warm. Instead,

start the engine with the throttle slightly open.

EBU33831

Operating the drive select lever and

driving in reverse

NOTICE

ECB00171

Before shifting, stop the ATV, otherwise the

transmission may be damaged.

Shifting: Forward

1. Bring the ATV to a complete stop.

2. Apply the rear brake lever.

3. Shift from neutral to forward by moving the

drive select lever along the shift guide.

TIP

Make sure that the drive select lever is completely

shifted into position.

4. Open the throttle lever gradually.

Shifting: Reverse

WARNING

EWB00721

Improper operation in reverse could make you

hit an obstacle or even a person behind you,

resulting in serious injury. When you shift into

reverse, make sure there are no people or ob-

stacles behind you. When it is safe to proceed,

go slowly.

1. Drive select lever

2. F (Forward)

3. N (Neutral)

4. R (Reverse)

7-4

1. Bring the ATV to a complete stop.

2. Apply the rear brake lever.

3. Shift from neutral to reverse by moving the

drive select lever along the shift guide.

TIP

When in reverse, the reverse indicator light should

come on. If the indicator light does not come on,

have a Yamaha dealer check the electrical circuit.

4. Check behind for people or obstacles, and

then release the rear brake lever.

5. Open the throttle lever gradually and continue

to watch to the rear while backing.

EBU40151

Engine break-in

There is never a more important period in the life

of your engine than the first 240 km (150 mi) or 15

hours of operation. For this reason, you should fol-

low the engine break-in instructions carefully.

Since the engine is brand new, do not put an ex-

cessive load on it for the first 240 km (150 mi) or

15 hours. During this period the various parts in

the engine wear and polish themselves to the cor-

rect operating clearances. Avoid prolonged full-

throttle operation or any condition that might re-

sult in engine overheating.

0–120 km (0–75 mi) or 0–8 hours

Avoid prolonged operation above 1/2 throttle.

Vary the speed of the ATV regularly. Do not oper-

ate it at one set throttle position.

120–240 km (75–150 mi) or 8–15 hours

Avoid prolonged operation above 3/4 throttle. Rev

the engine freely, but do not use full throttle at any

time.

1. Drive select lever

2. F (Forward)

3. N (Neutral)

4. R (Reverse)

7-5

240 km (150 mi) or 15 hours and beyond

The ATV can now be operated normally.

NOTICE

ECB00221

If any engine trouble should occur during the

engine break-in period, immediately have a

Yamaha dealer check the ATV.

EBU30021

Parking

When parking the ATV, apply the rear brake lever,

shift the drive select lever into the forward posi-

tion, stop the engine, apply the parking brake, and

then turn the fuel cock to “OFF”.

EBU20765

Parking on a slope

WARNING

EWB00832

Avoid parking on hills or other inclines. Parking

on a hill or other incline could cause the ATV to

roll out of control, increasing the chance of an

accident. If you must park on an incline, place

the ATV transversely across the incline, shift

the drive select lever to the forward position,

stop the engine, apply the parking brake, and

then block the front and rear wheels with rocks

or other objects.

Never park the ATV on hills that are too steep

to walk up easily.

1. With the transmission in the forward position,

bring the ATV to a stop by applying the

brakes.

2. Stop the engine.

3. With the rear brake lever applied, apply the

parking brake, and then slowly release the

rear brake lever.

4. Turn the fuel cock to “OFF”.

1. Parking brake lock plate

7-6

EBU20912

Accessories and loading

EBU20922

Genuine Yamaha Accessories

Choosing accessories for your ATV is an impor-

tant decision. Genuine Yamaha Accessories,

which are available only from a Yamaha dealer,

have been designed, tested, and approved by

Yamaha for use on your ATV. Many companies

with no connection to Yamaha manufacture parts

and accessories or offer other modifications for

Yamaha vehicles. Yamaha is not in a position to

test the products that these aftermarket compa-

nies produce. Therefore, Yamaha can neither en-

dorse nor recommend the use of accessories not

sold by Yamaha or modifications not specifically

recommended by Yamaha, even if sold and in-

stalled by a Yamaha dealer.

Aftermarket parts, accessories, and modifica-

tions

While you may find aftermarket products similar in

design and quality to genuine Yamaha Accesso-

ries, recognize that some aftermarket accessories

or modifications are not suitable because of po-

tential safety hazards to you or others. Installing

aftermarket products or having other modifica-

tions performed to your ATV that change any of

the vehicle’s design or operation characteristics

can put you and others at greater risk of serious

injury or death. You are responsible for injuries re-

lated to changes in the vehicle.

Keep the following in mind when considering an

accessory or operating an ATV which has acces-

sories.

Accessories should be rigidly and securely

mounted. An accessory which can shift position

or come off while you are riding could affect

your ability to control the ATV.

7-7

Do not mount an accessory where it could inter-

fere with your ability to control the ATV. Exam-

ples include (but are not limited to) a heavy or

bulky object attached to the handlebars which

could make steering difficult, an accessory that

limits your ability to move around on the seat, or

one that limits your view.

Use extra caution when riding an ATV with ac-

cessories. The ATV may handle differently than

it does without accessories.

EBU33880

WARNING

EWB00821

Never exceed the stated load capacity for this

ATV. Overloading this ATV or carrying or tow-

ing cargo improperly could cause changes in

ATV handling which could lead to an accident.

Cargo should be properly distributed and se-

curely attached. Reduce speed when carrying

cargo or pulling a trailer. Allow greater dis-

tance for braking.

As originally equipped, this ATV is not designed to

carry cargo or tow a trailer. If you choose to add

accessories so that you can carry cargo or tow a

trailer, you must use common sense and good

judgment as the stability and handling of an ATV

can be changed. When adding accessories, keep

the following points in mind:

Never exceed the weight limits shown. An over-

loaded ATV can be unstable.

If you are carrying cargo and towing a trailer, in-

clude the tongue weight in the maximum ATV

load limit.

Load cargo on the carriers as close to the center

of the ATV as possible. Put cargo at the rear of

the front carrier, at the front of the rear carrier,

and center it.

Tie down cargo securely to the carriers. Make

sure cargo in the trailer cannot move around. A

shifting load can cause an accident.

Make sure the load does not interfere with con-

trols or your ability to see where you are going.

Ride more slowly than you would without a

load. The more weight you carry, the slower you

should go.

MAXIMUM LOADING LIMIT

ATV loading limit (total weight of rider, car-

go, accessories, and tongue weight):

82.0 kg (181 lb)

7-8

Allow more braking distance. A heavier ATV

takes longer to stop.

Avoid making sharp turns unless at very slow

speeds.

Avoid hills and rough terrain. Choose terrain

carefully. Added weight affects the stability and

handling of the ATV.

EBU40423

Towing the vehicle

NOTICE

ECB04011



 Do not tow this vehicle for extended distanc-

es or at speeds of more than 16 km/h (10

mph).



 The transmission is not lubricated when the

engine is not running. As such, towing can

cause severe and irreparable wear.

8-1

EBU21142

RIDING YOUR ATV

8-2

EBU34101

GETTING TO KNOW YOUR ATV

This ATV is intended for recreational use by young

operators under adult supervision. This section,

“Riding your ATV”, provides general riding instruc-

tions which are appropriate for all types of riding.

Riding your ATV requires special skills acquired

through practice over a period of time. Take the

time to learn the basic techniques well before at-

tempting more difficult maneuvers.

Riding your new ATV can be a very enjoyable ac-

tivity, providing you with hours of pleasure. But it

is essential to familiarize yourself with the opera-

tion of the ATV to achieve the skill necessary to

enjoy riding safely. Before you begin to ride, be

sure you have read this manual completely and

understand how to operate all of the ATV’s con-

trols. Pay particular attention to the safety infor-

mation on pages 3-1 to 3-7 and all notice and

warning labels on the vehicle.

RIDE WITH CARE AND GOOD JUDGMENT

Beginning riders should get training from a

certified instructor.

WARNING

EWB01382



 Do not operate this ATV or allow anyone else

to operate it without proper instruction. The

risk of an accident is greatly increased if the

operator does not know how to operate the

ATV properly in different situations and on

different types of terrain.



 Do not operate this ATV at speeds too fast

for your skills or the conditions, as this in-

creases your chances of losing control of the

ATV and an accident. Always go at a speed

that is proper for the terrain, visibility and op-

erating conditions, and your experience.

Riding your ATV requires skills acquired

through practice over a period of time.

Become familiar with riding this ATV by riding at

slow speeds first, even if you have experience rid-

ing other ATVs. Do not attempt to operate it at

higher performance levels until you are familiar

with this ATV’s handling and performance charac-

8-3

teristics. Take the time to learn the basic tech-

niques well before attempting more difficult

maneuvers.

Not recommended for children under 10 years

of age.

WARNING

EWB03530

A child under 10 should never operate an ATV

with engine size greater than 70 cc. Use by

children of ATVs that are not recommended for

their age can lead to severe injury or death of

the child.

This ATV is designed to carry the operator only

– passengers prohibited.

The long seat is to allow the operator to shift posi-

tion as needed during operation. It is not for carry-

ing passengers. WARNING! Never carry a

passenger. Carrying a passenger on this ATV

greatly reduces your ability to balance and

control this ATV. You could have an accident,

resulting in severe injury or death to you and/or

your passenger. [EWB01402]

UNDER

8-5

Pre-operation checks

Always inspect your ATV before use to make sure

that it is safe operating condition. Perform the pre-

operation checks listed on page 6-1. Follow the

maintenance schedules and procedures as de-

scribed in the “Periodic Maintenance and Adjust-

ment” section of this manual. WARNING! Failure

to inspect the ATV before riding it or failure to

maintain it properly increases the possibility of

an accident and equipment damage. [EWB01433]

Speed limiter

For beginning riders, riders less experienced with

this model, or whenever limited speed is desir-

able, the throttle lever housing is equipped with a

vehicle speed limiter. The speed limiter keeps the

throttle from fully opening, even when the throttle

lever is pushed to the maximum. Turning in the

adjusting screw limits the maximum engine power

available and decreases the maximum speed of

the ATV. Turning in the adjusting screw decreases

top speed, and turning it out increases top speed.

(See page 5-3.)

This model also has an engine speed limiter plate

to limit the amount of engine power available.

Yamaha recommends that all beginning riders

start off with the engine speed limiter plate in-

stalled and the vehicle speed limiter adjusting

screw turned in to limit the amount of speed avail-

able while they learn. The vehicle speed limiter

may be gradually adjusted to increase maximum

speed as the beginner becomes more familiar with

operating the ATV. Parents should decide when to

adjust the ATV for more power as their young-

ster’s riding skills improve. Once the ATV rider can

operate with skill at the top speed permitted by

adjusting the vehicle speed limiter alone, the en-

gine speed limiter plate can be removed. Since re-

moval of this plate will result in a significant

increase in power, turn the vehicle speed limiter

8-6

adjusting screw back in again and adjust it out in

stages as you did before. For engine speed limiter

plate removal instructions, see page 5-4.

Loading and accessories

WARNING

EWB00973

Improper loading or towing can increase the

risk of loss of control, an overturn, or other ac-

cident. To reduce the risk of an accident:



 Do not exceed the maximum loading limits

for the vehicle (see “MAXIMUM LOADING

LIMIT” below or vehicle labeling).



 Make sure the load does not interfere with

your control or ability to see where you are

going.



 Reduce speed and allow more room to stop.

A heavier vehicle takes longer to stop.



 Avoid hills and rough terrain. Choose terrain

carefully. Use extreme caution when towing

or carrying a load on inclines.



 Turn gradually and go slowly.

As originally equipped, this ATV is not designed to

carry cargo or tow a trailer. If you choose to add

accessories to carry cargo, you must use com-

mon sense and good judgment.

Use extra caution when riding the ATV with addi-

tional loads, such as accessories or cargo. The

ATV’s handling may be adversely affected. Re-

duce your speed when adding additional loads.

1. Adjusting screw

MAXIMUM LOADING LIMIT

ATV loading limit (total weight of cargo, rid-

er, accessories, and tongue weight):

82.0 kg (181 lb)

8-7

During operation

Always keep your feet on the footboards during

operation; otherwise, they may contact the rear

wheels. WARNING! Removing even one hand or

foot can reduce your ability to control the ATV

or could cause you to lose your balance and

fall off of the ATV. If you remove a foot from a

footboard, your foot or leg may come into con-

tact with the rear wheels, which could injure

you or cause an accident. [EWB01472]

Avoid wheelies and jumping. WARNING! At-

tempting wheelies, jumps, and other stunts in-

creases the chance of an accident, including

an overturn. Never attempt stunts, such as

wheelies or jumps. Don’t try to show off.

[EWB01482]

Modifications and accessories

Never modify this ATV through improper installa-

tion or use of accessories or other modification. All

parts and accessories added to this ATV should

be genuine Yamaha or equivalent components

designed for use on this ATV and should be in-

stalled and used according to instructions. If you

have questions, consult an authorized ATV dealer.

WARNING! Operating this ATV with improper

8-8

modifications may cause changes in handling

which in some situations could lead to an acci-

dent. [EWB01492]

Exhaust system

WARNING

EWB01502



 Dry grass or brush or other combustible ma-

terial accumulated around the engine area

could catch fire. Do not operate, idle, or park

the ATV in dry grass or other dry ground cov-

er. Keep the engine area free of dry grass,

brush, or other combustible material.



 Someone touching the exhaust system dur-

ing or after operation could be burned. Do

not touch the hot exhaust system. Do not

park the ATV in a place where others might

be likely to touch it.

The muffler and other engine parts become ex-

tremely hot during operation and remain hot after

the engine has stopped. To reduce the risk of fire

during operation or after leaving the ATV, do not

let brush, grass and other materials collect under

the vehicle, near the muffler or exhaust pipe, or

next to other hot parts. Check under the vehicle

after operating in areas where combustible mate-

rials may have collected. Do not idle or park the

vehicle in long dry grass or other dry ground cov-

er.

To prevent burns, avoid touching the exhaust sys-

tem. Park the ATV in a place where pedestrians or

children are not likely to touch it.

8-9

BE CAREFUL WHERE YOU RIDE

This ATV is designed for use on unpaved surfaces

only. WARNING! Paved surfaces may seriously

affect handling and control of the ATV, and

may cause the ATV to go out of control. Always

avoid paved surfaces, including sidewalks,

driveways, parking lots and streets. [EWB01512]

While riding on unpaved public streets or roads

may be legal in your area, such operation can in-

crease the risk of collision with other vehicles.

Watch carefully for other vehicles. Make sure you

know your country’s laws and regulations before

you ride on unpaved public streets or roads. Do

not ride on any paved public street, road or motor-

way. WARNING! Never operate this ATV on any

paved street, paved road or motorway. You

can collide with another vehicle.

[EWB01522]

Know the terrain where you ride. Ride cautiously in

unfamiliar areas. Stay alert for holes, rocks, or

roots in the terrain, and other hidden hazards

which may cause the ATV to upset. WARNING!

The ATV could go out of control if you do not

have enough time to react to hidden rocks,

8-10

bumps, or holes. Go slowly and be extra care-

ful when operating on unfamiliar terrain. Al-

ways be alert to changing terrain conditions

when operating the ATV.

[EWB01532]

Do not operate on rough, slippery, or loose terrain

until you have learned and practiced the skills nec-

essary to control the ATV on such terrain. Always

be especially cautious on these kinds of terrain.

WARNING! Failure to use extra care when op-

erating on excessively rough, slippery, or loose

terrain could cause loss of traction or ATV con-

trol, which could result in an accident, includ-

ing an overturn. [EWB01542]

When riding in an area where you might not easily

be seen, such as desert terrain, mount a caution

flag on the ATV. DO NOT use the flag pole bracket

as a trailer hitch. WARNING! You could collide

with another vehicle if operating in areas

where you cannot easily be seen. Mount a cau-

tion flag on the ATV to make you more visible.

Watch carefully for other vehicles.

[EWB01552]

8-11

Do not ride in areas posted “no trespassing”.

Do not ride on private property without getting

permission.

Select a large, flat, unpaved area to become famil-

iar with your ATV. Make sure that this area is free

of obstacles and other riders. You should practice

control of the throttle, brakes, and turning tech-

niques in this area before trying more difficult ter-

rain.

Set the parking brake and follow the instruction on

page 7-1 to start the engine. Once it has warmed

up you are ready to begin riding your ATV. Re-

member that the engine and exhaust pipe will be

hot when riding and afterwards; do not allow skin

or clothing to come in contact with these compo-

nents.

With the engine idling, release the parking brake.

Apply the throttle slowly and smoothly. You will

start to accelerate. If the throttle is applied too

8-12

abruptly, the vehicle may lurch forward or the front

wheels may lift off the ground, resulting in a loss of

directional control. Avoid higher speeds until you

are thoroughly familiar with the operation of your

ATV.

When slowing down or stopping, release the

throttle and apply the brakes smoothly and evenly.

Improper use of the brakes can cause the tires to

lose traction, reducing control and increasing the

possibility of an accident.

TURNING YOUR ATV

WARNING

EWB01772

Always follow proper procedures for turning as

described in this Owner’s Manual. Practice

turning at low speeds before attempting to turn

at faster speeds. Do not turn at speeds too fast

for your skills or the conditions. ATV could go

out of control, causing a collision or overturn.

To achieve maximum traction on unpaved surfac-

es, the two rear wheels turn together at the same

speed. Therefore, unless the wheel on the inside

of the turn is allowed to slip or lose some traction,

the ATV will resist turning. A special turning tech-

nique must be used to allow the ATV to make

turns quickly and easily. It is essential that this skill

be learned first at low speed.

As you approach a curve, slow down and begin to

turn the handlebars in the desired direction. As

you do so, put your weight on the footboard to the

outside of the turn (opposite your desired direc-

tion) and lean your upper body into the turn. Use

the throttle to maintain an even speed through the

turn. This maneuver will let the wheel on the inside

of the turn slip slightly, allowing the ATV to make

the turn properly.

8-13

8This procedure should be practiced at slow speed

many times in a large unpaved area with no obsta-

cles. If an incorrect technique is used, your ATV

may continue to go straight. If the ATV doesn’t

turn, come to a stop and then practice the proce-

dure again. If the riding surface is slippery or

loose, it may help to position more of your weight

over the front wheels by moving forward on the

seat.

Once you have learned this technique, you should

be able to perform it at higher speeds or in tighter

curves.

Improper riding procedures such as abrupt throt-

tle changes, excessive braking, incorrect body

movements, or too much speed for the sharpness

of the turn may cause the ATV to tip. If the ATV be-

gins to tip over to the outside while negotiating a

turn, lean more to the inside. It may also be nec-

essary to gradually let off on the throttle and steer

to the outside of the turn to avoid tipping over.

Remember: Avoid higher speeds until you are

thoroughly familiar with the operation of your ATV.

CLIMBING UPHILL

WARNING

EWB01672

Climbing hills improperly can cause overturns

or loss of control. Use proper riding techniques

described in this Owner’s Manual.



 Never operate the ATV on hills too steep for

the ATV or for your abilities. The ATV can

overturn more easily on extremely steep hills

than on level surfaces or small hills.



 Always check the terrain carefully before you

start up any hill. Never climb hills with exces-

sively slippery or loose surfaces.

1. Lean towards inside of turn.

2. Support your weight on the outer footboard.

8-14



 Shift your weight forward.



 Never open the throttle suddenly. The ATV

could flip over backwards.



 Never go over the top of any hill at high

speed. An obstacle, a sharp drop, or another

vehicle or person could be on the other side

of the hill.



 Never attempt to turn the ATV around on any

hill until you have mastered the turning tech-

nique as described in the Owner’s Manual on

level ground. Be very careful when turning

on any hill.



 Avoid crossing the side of a steep hill if pos-

sible. When crossing the side of a hill, shift

your weight to the uphill side of the ATV.

8-15

Do not attempt to climb hills until you have mas-

tered basic maneuvers on flat ground. Always

check the terrain carefully before attempting any

hill. In all cases avoid inclines with slippery or

loose surfaces, or obstacles that might cause you

to lose control.

To climb a hill, you need traction, momentum, and

steady throttle. Travel fast enough to maintain mo-

mentum, but not so fast that you cannot react to

changes in the terrain as you climb.

It is important when climbing a hill to make sure

that your weight is transferred forward on the ATV.

This can be accomplished by leaning forward and,

on steeper inclines, standing on the footboards

and leaning forward over the handlebars. When-

ever possible, ride straight up hills.

Slow down when you reach the crest of the hill if

you cannot see clearly what is on the other side –

there could be another person, an obstacle, or a

sharp drop-off. Use common sense and remem-

ber that some hills are too steep for you to climb

or descend.

If you are climbing a hill and you find that you have

not properly judged your ability to make it to the

top, you should turn the ATV around while you still

have forward motion (provided you have the room

to do so) and go down the hill.

If your ATV has stalled or stopped and you believe

you can continue up the hill, restart carefully to

make sure you do not lift the front wheels which

could cause you to lose control. If you are unable

to continue up the hill, dismount the ATV on the

uphill side. Physically turn the ATV around and

then descend the hill.

If you start to roll backwards, DO NOT apply the

brakes abruptly. Apply only the front brake. When

fully stopped, apply the rear brake as well, and

then lock the parking brake. The ATV could easily

tip over backwards so immediately dismount the

8-16

ATV on the uphill side or to the left-hand side

when the ATV is pointed straight uphill. If possible,

get help to turn the ATV around and then remount

it when safe and ride downhill carefully as ex-

plained in the following section. WARNING! Stall-

ing, rolling backwards or improperly

dismounting while climbing a hill could result in

ATV overturning. If you cannot control the ATV,

dismount immediately on the uphill side.

[EWB01803]

RIDING DOWNHILL

WARNING

EWB01132

Going down a hill improperly could cause over-

turns or loss of control. Always follow proper

procedures for going down hills as described

in this Owner’s Manual.



 Always check the terrain carefully before you

start down any hill.



 Never operate the ATV on hills too steep for

the ATV or for your abilities. The ATV can

overturn more easily on extremely steep hills

than on level surfaces or small hills.



 Shift your weight backward and to the up

side of the hill.



 Never go down a hill at high speed.



 Avoid going down a hill at an angle that

would cause the ATV to lean sharply to one

side. Go straight down the hill where possi-

ble.



 Improper braking can cause the wheels on

the uphill side to come off the ground or

cause loss of traction. Gradually apply only

the rear brake when going downhill.

8-17

When riding your ATV downhill, shift your weight

as far to the rear and uphill side of the ATV as pos-

sible. Move back on the seat and sit with your

arms straight. Engine compression will do most of

the braking for you.

Use caution while descending a hill with loose or

slippery surfaces. Braking ability and traction may

be adversely affected by these surfaces. Improper

braking may also cause a loss of traction. Gradu-

ally apply only the rear brake.

Whenever possible, ride your ATV straight down-

hill. Avoid sharp angles which could allow the ATV

to tip or roll over. Carefully choose your path and

ride no faster than you will be able to react to ob-

stacles which may appear. CROSSING A SLOPE

WARNING

EWB01633

Improperly crossing hills or turning on hills

could cause loss of control or cause the ATV to

overturn.



 Always follow proper procedures as de-

scribed in the Owner’s Manual.



 Avoid hills with excessively slippery or loose

surfaces.



 Avoid crossing the side of a steep hill.



 Shift your weight to the uphill side of the ATV.

8-18



 Never attempt to turn the ATV around on any

hill until you have mastered the turning tech-

nique as described in the Owner’s Manual on

level ground. Be very careful when turning

on any hill.

Traversing a sloping surface on your ATV requires

you to properly position your weight to maintain

proper balance. Be sure that you have learned the

basic riding skills on flat ground before attempting

to cross a sloping surface. Avoid slopes with slip-

pery surfaces or rough terrain that may upset your

balance.

As you travel across a slope, lean your body in the

uphill direction. It may be necessary to correct the

steering when riding on loose surfaces by pointing

the front wheels slightly uphill. When riding on

slopes, be sure not to make sharp turns either up

or down hill.

If your ATV does begin to tip over, gradually steer

in the downhill direction if there are no obstacles

in your path. As you regain proper balance, grad-

ually steer again in the direction you wish to travel.

CROSSING THROUGH SHALLOW WATER

WARNING

EWB01642

Operating this vehicle through deep or fast-

flowing water can lead to loss of control or an

overturn. To reduce your risk of drowning or

other injuries, use care when crossing through

water. Never operate this ATV water deeper

than the depth specified in your Owner’s Man-

ual, as tires may float, increasing the risk of an

overturn.

8-19

The ATV can be used to cross slow moving, shal-

low water of up to a maximum of 20 cm (8 in) in

depth. Before entering the water, choose your

path carefully. Enter where there is no sharp drop

off, and avoid rocks or other obstacles which may

be slippery or upset the ATV. Drive slowly and

carefully.

Test your brakes after leaving the water. If neces-

sary, apply them several times to let friction dry

out the linings. Do not continue to ride your ATV

without verifying that you have regained proper

braking ability. WARNING! Wet brakes may have

reduced stopping ability, which could cause

loss of control.

[EWB02622]

After riding your ATV in water, be sure to drain the

trapped water by removing the check hose at the

bottom of the air filter case. NOTICE: Undrained

water can cause damage or improper opera-

tion. [ECB00842]

Wash the ATV in fresh water if it has been operat-

ed in salt water or muddy conditions.

8-20

RIDING OVER ROUGH TERRAIN

WARNING

EWB01652

Riding improperly over obstacles could cause

loss of control or a collision. Before operating

in a new area, check for obstacles. Never at-

tempt to ride over large obstacles, such as

large rocks or fallen trees. When you go over

obstacles, always follow proper procedures as

described in the Owner’s Manual.

Riding over rough terrain should be done with

caution. Look out for obstacles which could cause

damage to the ATV or could lead to an upset or

accident. Be sure to keep your feet firmly mounted

on the footboards at all times. Avoid jumping the

ATV as loss of control and damage to the ATV may

result.

SLIDING AND SKIDDING

WARNING

EWB01663

Skidding or sliding improperly may cause you

to lose control of this ATV. You may also regain

traction unexpectedly, which may cause the

ATV to overturn.



 Learn to safely control skidding or sliding by

practicing at low speeds and on level,

smooth terrain.



 On extremely slippery surfaces, such as ice,

go slowly and be very cautious in order to re-

duce the chance of skidding or sliding out of

control.

Care should be used when riding on loose or slip-

pery surfaces since the ATV may slide. If unex-

pected and uncorrected, sliding could lead to an

accident.

1. Air filter case check hose

8-21

To reduce the tendency for the front wheels to

slide in loose or slippery conditions, positioning

your weight over the front wheels will sometimes

help.

If the rear wheels of your ATV start to slide side-

ways, control can usually be regained (if there is

room to do so) by steering in the direction of the

slide. Applying the brakes or accelerating is not

recommended until you have corrected the slide.

With practice, over a period of time, skill at con-

trolled sliding can be developed. The terrain

should be chosen carefully before attempting

such maneuvers, since both stability and control

are reduced. Bear in mind that sliding maneuvers

should always be avoided on extremely slippery

surfaces such as ice, since all control may be lost.

WHAT TO DO IF...

This section is designed to be a reference guide

only. Be sure to read each section on riding tech-

niques completely.

8-22

WHAT TO DO...

 If your ATV doesn’t turn when you want it to:

Bring the ATV to a stop and practice the turning

maneuvers again. Be sure you are putting your

weight on the footboard to the outside of the

turn. Position your weight over the front wheels

for better control. (See page 8-12.)

 If your ATV begins to tip while turning:

Lean more into the turn to regain balance. If

necessary, gradually let off the throttle and/or

steer to the outside of the turn. (See page 8-12.)

 If your ATV starts to slide sideways:

Steer in the direction of the slide if you have the

room. Applying the brakes or accelerating is not

recommended until you have corrected the

slide. (See page 8-20.)

 If your ATV can’t make it up a hill you are trying

to climb:

Turn the ATV around if you still have forward

speed. If not, stop, dismount on the uphill side

of the ATV and physically turn the ATV around.

If the ATV starts to slip backwards, DO NOT

USE THE REAR BRAKE – the ATV may tip over

on top of you. Dismount the ATV on the uphill

side. (See page 8-13.)

 If your ATV is traversing a sloping surface:

Be sure to ride with your weight positioned to-

wards the uphill side of the ATV to maintain

proper balance. If the ATV starts to tip, steer

down the hill (if there are no obstacles in your

way) to regain balance. If you discover that the

ATV is going to tip over, dismount on the uphill

side. (See page 8-17.)

 If your ATV encounters shallow water:

Ride slowly and carefully through slow moving

water, watching for obstacles. Be sure to let wa-

ter drain from the ATV and CHECK YOUR

BRAKES FOR PROPER OPERATION when you

come out of the water. Do not continue to ride

your ATV until you have regained adequate

braking ability. (See page 8-18.)

9-1

EBU28789

PERIODIC MAINTENANCE AND ADJUSTMENT

EBU21677

Periodic inspection, adjustment, and lubrication

will keep your vehicle in the safest and most effi-

cient condition possible. Safety is an obligation of

the vehicle owner and operator. The most impor-

tant points of vehicle inspection, adjustment, and

lubrication are explained on the following pages.

WARNING

EWB01842

Failure to properly maintain the vehicle or per-

forming maintenance activities incorrectly may

increase your risk of injury or death during ser-

vice or while using the vehicle. If you are not fa-

miliar with vehicle service, have a Yamaha

dealer perform the service.

WARNING

EWB02563

Turn off the engine when performing mainte-

nance unless otherwise specified.



 A running engine has moving parts that can

catch on body parts or clothing and electri-

cal parts that can cause shocks or fires.



 Running the engine while servicing can lead

to eye injury, burns, fire, or carbon monoxide

poisoning - possibly leading to death. See

page 3-6 for more information about carbon

monoxide.

WARNING

EWB02691

Brake discs, calipers, drums, and linings can

become very hot during use. To avoid possible

burns, let brake components cool before

touching them.

The intervals given in the periodic maintenance

charts should be considered as a general guide

under normal riding conditions. However, DE-

PENDING ON THE WEATHER, TERRAIN, GEO-

GRAPHICAL LOCATION, AND INDIVIDUAL USE,

THE MAINTENANCE INTERVALS MAY NEED TO

BE SHORTENED.

9-2

EBU33902

Owner’s Manual and tool kit

Place the Owner’s Manual in a plastic bag, and

along with the tool kit, store it on the bottom of the

seat.

The information included in this manual and the

tools provided in the tool kit are intended to assist

you in the performance of preventive maintenance

and minor repairs. However, additional tools are

necessary to perform certain maintenance work

correctly.

TIP

 There is a tire pressure gauge in the tool kit.

 If you do not have the tools or experience re-

quired for a particular job, have a Yamaha deal-

er perform it for you.

1. Tool kit

2. Owner’s Manual

1 2

9-3

EBU40160

Periodic maintenance chart: Emission control system

TIP

For ATVs not equipped with an odometer or an hour meter, follow the month maintenance intervals in-

stead.

For odometer or hour meter-equipped vehicles, follow the month maintenance interval if the ATV isn’t

ridden for the stated distance or engine operating hours.

Items marked with an asterisk should be performed by a Yamaha dealer as they require special tools,

data and technical skills.

NO. ITEM CHECK OR MAINTENANCE

JOB

INITIAL EVERY

Whichev-

er comes

first

month 1 3 6 6 12

km (mi) 240

(150)

1300

(800)

2500

(1600)

2500

(1600)

5000

(3200)

hours 15 80 160 160 320

1 * Fuel line • Check fuel hoses for cracks or other damage, and

replace if necessary. √√√

2 Spark plug • Check condition and clean, regap, or replace if

necessary. √ √ √ √ √

3 * Valves • Check valve clearance and adjust if necessary. √ √ √ √

4 * Carburetor

• Check starter (choke) operation and correct if

necessary.

• Check engine idling speed and adjust if neces-

sary.

√ √ √ √

5 * Crankcase breath-

er system

• Check breather hose for cracks or other damage,

and replace if necessary. √√√

9-4

6 * Exhaust system

• Check for leakage and replace gasket(s) if neces-

sary.

• Check for looseness and tighten all screw clamps

and joints if necessary.

√√√

7 Spark arrester • Clean. √ √ √

NO. ITEM CHECK OR MAINTENANCE

JOB

INITIAL EVERY

Whichev-

er comes

first

month 1 3 6 6 12

km (mi) 240

(150)

1300

(800)

2500

(1600)

2500

(1600)

5000

(3200)

hours 15 80 160 160 320

9-5

EBU40170

Periodic maintenance chart: General maintenance and lubrication

TIP

For ATVs not equipped with an odometer or an hour meter, follow the month maintenance intervals in-

stead.

For odometer or hour meter-equipped vehicles, follow the month maintenance interval if the ATV isn’t

ridden for the stated distance or engine operating hours.

Items marked with an asterisk should be performed by a Yamaha dealer as they require special tools,

data and technical skills.

NO. ITEM CHECK OR MAINTENANCE

JOB

INITIAL EVERY

Whichev-

er comes

first

month 1 3 6 6 12

km (mi) 240

(150)

1300

(800)

2500

(1600)

2500

(1600)

5000

(3200)

hours 15 80 160 160 320

1 Air filter element • Clean and replace if necessary. Every 20–40 hours (more often in wet or

dusty areas)

2 Air filter check hose • Clean. √ √ √ √ √

3*Front brake

• Check operation and correct if necessary.

• Check brake lever free play and adjust if neces-

sary.

√ √ √ √ √

• Replace brake shoes. Whenever worn to the limit

4*Rear brake

• Check operation and correct if necessary.

• Check brake lever free play and adjust if neces-

sary.

√ √ √ √ √

• Replace brake shoes. Whenever worn to the limit

9-6

5 * Wheels • Check runout and for damage, and replace if nec-

essary. √ √ √ √

6 * Tires

• Check tread depth and for damage, and replace if

necessary.

• Check air pressure and balance, and correct if

necessary.

√ √ √ √

7 * Wheel hub bearings • Check for looseness or damage, and replace if

necessary. √ √ √ √

8 * Front arm pivots • Lubricate with lithium-soap-based grease. √ √ √

9 Drive chain

• Check chain slack and adjust if necessary.

• Check rear wheel alignment and correct if neces-

sary.

• Clean and lubricate.

√ √ √ √ √

10 * Drive chain rollers • Check for wear and replace if necessary. √ √ √

11 * V-belt • Check for wear, cracks or other damage, and re-

place if necessary. √ √ √ √

12 * Chassis fasteners • Make sure that all nuts, bolts, and screws are

properly tightened. √ √ √ √ √

13 * Shock absorber as-

semblies

• Check operation and correct if necessary.

• Check for oil leakage and replace if necessary. √√√

14 * Front knuckle piv-

ots • Lubricate with lithium-soap-based grease. √ √ √

NO. ITEM CHECK OR MAINTENANCE

JOB

INITIAL EVERY

Whichev-

er comes

first

month 1 3 6 6 12

km (mi) 240

(150)

1300

(800)

2500

(1600)

2500

(1600)

5000

(3200)

hours 15 80 160 160 320

9-7

15 * Steering shaft • Lubricate with lithium-soap-based grease. √ √ √

16 * Steering system

• Check operation and repair or replace if dam-

aged.

• Check toe-in and adjust if necessary.

√ √ √ √ √

17 Engine oil

• Change.

• Check ATV for oil leakage, and correct if neces-

sary.

√ √ √ √

18 Engine oil strainer • Clean. √ √ √

19 Transmission oil

• Change.

• Check ATV for oil leakage, and correct if neces-

sary.

√ √

20 * Moving parts and

cables • Lubricate. √ √ √ √

21 * Throttle lever

• Check operation.

• Check throttle lever free play, and adjust if neces-

sary.

• Lubricate cable and lever housing.

√ √ √ √ √

22 * Brake switch • Check operation and correct if necessary. √ √ √ √ √

23 * Switches • Check operation and correct if necessary. √ √ √ √ √

NO. ITEM CHECK OR MAINTENANCE

JOB

INITIAL EVERY

Whichev-

er comes

first

month 1 3 6 6 12

km (mi) 240

(150)

1300

(800)

2500

(1600)

2500

(1600)

5000

(3200)

hours 15 80 160 160 320

9-9

EBU23216

Checking the spark plug

The spark plug is an important engine component,

which is easy to check. Since heat and deposits

will cause any spark plug to slowly erode, the

spark plug should be removed and checked in ac-

cordance with the periodic maintenance chart. In

addition, the condition of the spark plug can reveal

the condition of the engine.

To remove the spark plug

1. Remove the spark plug cap.

2. Remove the spark plug as shown, with the

spark plug wrench included in the tool kit.

To check the spark plug

1. Check that the porcelain insulator around the

center electrode of the spark plug is a medi-

um-to-light tan (the ideal color when the ATV

is ridden normally).

TIP

If the spark plug shows a distinctly different color,

the engine could be operating improperly. Do not

attempt to diagnose such problems yourself. In-

stead, have a Yamaha dealer check the ATV.

1. Spark plug cap

1. Spark plug wrench

9-10

2. Check the spark plug for electrode erosion

and excessive carbon or other deposits, and

replace it if necessary.

3. Measure the spark plug gap with a wire thick-

ness gauge and, if necessary, adjust the gap

to specification.

To install the spark plug

1. Clean the surface of the spark plug gasket

and its mating surface, and then wipe off any

grime from the spark plug threads.

2. Install the spark plug with the spark plug

wrench, and then tighten it to the specified

torque.

TIP

If a torque wrench is not available when installing

the spark plug, a good estimate of the correct

torque is 1/4–1/2 turn past finger tight. However,

the spark plug should be tightened to the speci-

fied torque as soon as possible.

3. Install the spark plug cap.

EBU37001

Engine oil

The engine oil level should be checked before

each ride. In addition, the oil must be changed at

the intervals specified in the periodic maintenance

chart.

Specified spark plug:

NGK/CR6HSA

1. Spark plug gap

Spark plug gap:

0.6–0.7 mm (0.024–0.028 in)

Tightening torque:

Spark plug:

12 N·m (1.2 kgf·m, 8.9 lb·ft)

9-11

To check the engine oil level

1. Park the ATV on a level surface.

2. Wait for the engine to cool.

TIP

If the engine was started before checking the oil

level, wait 10 minutes. This will allow oil to settle

into the crankcase for an accurate reading.

3. Remove the engine oil filler cap and wipe the

dipstick with a clean rag.

4. Insert the dipstick into the filler hole, screw it

in, and then remove it again to check the oil

level.

5. If the engine oil is at or below the minimum

level mark, add sufficient quantity of the rec-

ommended engine oil. NOTICE: Be sure the

engine oil is at the correct level, otherwise

engine damage may result. [ECB00852]

6. Check the O-ring for damage, and then insert

the dipstick and tighten the engine oil filler

cap.

To change the engine oil

1. Park the ATV on a level surface.

1. Engine oil filler cap

2. O-ring

3. Engine oil dipstick

4. Maximum level mark

5. Minimum level mark

9-13

TIP

Be sure to wipe off spilled oil on any parts after the

engine and exhaust system have cooled down.

NOTICE

ECB00331



 Do not use oils with a diesel specification of

“CD” or oils of a higher quality than speci-

fied. In addition, do not use oils labeled “EN-

ERGY CONSERVING II” or higher.



 Make sure that no foreign material enters the

crankcase.

9. Check the engine oil filler cap O-ring for dam-

age, and then install and tighten the engine oil

filler cap.

10. Start the engine, and then let it idle for several

minutes while checking it for oil leakage. If oil

is leaking, immediately turn the engine off and

check for the cause.

11. Turn the engine off, wait at least ten minutes,

and then check the oil level and correct it if

necessary.

EBU38620

Why Yamalube

YAMALUBE oil is a Genuine YAMAHA Part born of

the engineers’ passion and belief that engine oil is

an important liquid engine component. We form

teams of specialists in the fields of mechanical en-

gineering, chemistry, electronics and track test-

ing, and have them develop the engine together

with the oil it will use. Yamalube oils take full ad-

vantage of the base oil’s qualities and blend in the

ideal balance of additives to make sure the final oil

clears our performance standards. Thus,

Yamalube mineral, semisynthetic and synthetic

oils have their own distinct characters and value.

Yamaha’s experience gained over many years of

research and development into oil since the

1960’s helps make Yamalube the best choice for

your Yamaha engine.

9-14

EBU34473

Transmission oil

The transmission case must be checked for oil

leakage before each ride. If any leakage is found,

have a Yamaha dealer check and repair the ATV.

In addition, the transmission oil must be changed

at the intervals specified in the periodic mainte-

nance chart.

To change the transmission oil

1. Place the ATV on a level surface.

2. Place an oil pan under the transmission case

to collect the used oil.

3. Remove the transmission oil filler cap and its

O-ring from the transmission case. 4. Remove the transmission oil drain bolt and its

gasket to drain the oil from the transmission

case.

1. Transmission oil filler cap

2. O-ring

1 2

9-15

5. Install the transmission oil drain bolt and its

new gasket, and then tighten the bolt to the

specified torque.

6. Refill with the specified amount of the recom-

mended oil. NOTICE: Make sure that no

foreign material enters the transmission

case. [ECB03380]

7. Check the oil filler cap O-ring for damage,

and replace it if necessary.

8. Install and tighten the oil filler cap.

9. Check the transmission case for oil leakage.

If oil is leaking, check for the cause.

EBU34111

Cleaning the air filter element

The air filter element should be serviced at the in-

tervals specified in the periodic maintenance

chart. Clean or, if necessary, replace the air filter

element more frequently if you are riding in unusu-

ally wet or dusty areas.

TIP

There is a check hose at the bottom of the air filter

case. If dust or water collects in this hose, empty

the hose and clean the air filter element and air fil-

ter case.

1. Transmission oil drain bolt

2. Gasket

Tightening torque:

Transmission oil drain bolt:

22 N·m (2.2 kgf·m, 16 lb·ft)

Recommended oil:

See page 11-1.

Oil quantity:

0.35 L (0.37 US qt, 0.31 Imp.qt)

9-16

1. Park the ATV on a level surface.

2. Remove the seat. (See page 5-13.)

3. Remove the air filter case cover by unhooking

the air filter case cover holders.

4. Remove the air filter element, and clean it with

solvent. WARNING! Always use parts

cleaning solvent to clean the air filter ele-

ment. Never use low-flash-point solvents

or gasoline to clean the air filter element

because the engine could catch fire or ex-

plode. [EWB03540]

1. Air filter case check hose

1. Air filter case cover

2. Air filter case cover holder

9-17

5. Squeeze the excess solvent out of the air filter

element and let it dry. NOTICE: Do not twist

the air filter element when squeezing it.

[ECB02310]

6. Check the air filter element and replace it if

damaged.

7. Apply Yamaha foam air filter oil or other qual-

ity foam air filter oil to the element.

TIP

The air filter element should be wet but not drip-

ping.

8. Insert the air filter element into the air filter

case.

9. Install the air filter case cover by hooking the

holders onto the air filter case. NOTICE:

Make sure that the air filter element is

properly seated in the air filter case. Never

operate the engine with the air filter ele-

1. Air filter element

9-18

ment removed. This will allow unfiltered air

to enter the engine, causing rapid engine

wear and possible engine damage. Addi-

tionally, operation without the air filter ele-

ment will affect carburetor jetting with

subsequent poor performance and possi-

ble engine overheating. [ECB00462]

10. Install the seat.

TIP

The air filter element should be cleaned every 20–

40 hours. It should be cleaned and lubricated

more often if the ATV is operated in extremely

dusty areas. When servicing the air filter element,

be sure to check the air inlet of the air filter case

for obstructions.

EBU33942

Cleaning the spark arrester

Be sure the exhaust pipe and muffler are cool be-

fore cleaning the spark arrester.

1. Remove the tailpipe bolt and nut.

2. Remove the spark arrester by pulling it out of

the muffler.

1. Spark arrester

2. Tailpipe bolt

3. Nut

9-19

3. Tap the spark arrester lightly, and then use a

wire brush to remove any carbon deposits.

4. Insert the spark arrester into the muffler and

align the bolt hole.

5. Install the tailpipe bolt and nut, and then tight-

en the nut to the specified torque.

WARNING

EWB02342

Always let the exhaust system cool prior to

touching exhaust components.

Do not start the engine with the spark arrester

removed. Sparks or exhaust particulate can

cause eye injury, burns, or start a fire.

EBU23942

Adjusting the carburetor

The carburetor should be checked and, if neces-

sary, adjusted at the intervals specified in the pe-

riodic maintenance chart. The carburetor is an

important part of the engine and requires very so-

phisticated adjustment. Therefore, most carbure-

tor adjustments should be left to a Yamaha dealer,

who has the necessary professional knowledge

and experience. The adjustment described in the

following section, however, may be performed by

the owner as part of routine maintenance.

NOTICE

ECB00481

The carburetor has been set and extensively

tested at the Yamaha factory. Changing these

settings without sufficient technical knowl-

edge may result in poor performance of or

damage to the engine.

EBU24002

Adjusting the engine idling speed

The engine idling speed must be checked and, if

necessary, adjusted as follows at the intervals

specified in the periodic maintenance chart.

TIP

A diagnostic tachometer is needed to make this

adjustment.

1. Start the engine and warm it up.

TIP

The engine is warm when it quickly responds to

the throttle.

Tightening torque:

Tailpipe nut:

10 N·m (1.0 kgf·m, 7.4 lb·ft)

9-20

2. Attach the tachometer to the spark plug lead.

3. Check the engine idling speed and, if neces-

sary, adjust it to specification by turning the

throttle stop screw at the carburetor. To in-

crease the engine idling speed, turn the throt-

tle stop screw in direction (a), and to decrease

it, turn the screw in direction (b).

TIP

If the specified idling speed cannot be obtained as

described above, have a Yamaha dealer make the

adjustment.

EBU38470

Adjusting the throttle lever free play

1. Throttle stop screw

Engine idling speed:

1600–1800 r/min

(a)

(b)

1. Rubber cover

2. Throttle lever free play adjusting nut

3. Locknut

4. Throttle lever free play

Throttle lever free play:

1.5–4.0 mm (0.06–0.16 in)

(b)

(a)

9-21

Periodically check the throttle lever free play and

adjust if necessary.

TIP

The engine idling speed must be checked and ad-

justed before adjusting the throttle lever free play.

1. Slide the rubber cover away from the locknut.

2. Loosen the locknut.

3. To increase the throttle lever free play, turn

the throttle lever free play adjusting nut in di-

rection (a). To decrease the throttle lever free

play, turn the adjusting nut in direction (b).

4. Tighten the locknut.

5. Slide the rubber cover to its original position.

EBU24062

Valve clearance

The valve clearance changes with use, resulting in

improper air-fuel mixture and/or engine noise. To

prevent this from occurring, the valve clearance

must be adjusted by a Yamaha dealer at the inter-

vals specified in the periodic maintenance chart.

EBU29602

Brakes

Replacement of brake components requires pro-

fessional knowledge. Brake service should be

performed by a Yamaha dealer.

WARNING

EWB02572

Operating with improperly serviced or adjust-

ed brakes could lead to a loss in braking ability

and an accident.

EBU34512

Checking the front and rear brake

shoes

The front and rear brake shoes must be checked

for wear at the intervals specified in the periodic

maintenance chart. Without disassembling the

brake, this can be performed by checking the po-

sition of the brake lever free play adjusting bolts or

nut.

Front brakes

To check front brake shoe wear, check the posi-

tion of the adjusting bolts. If a bolt extends more

than 12 mm (0.47 in) from its locknut, the brake

shoes need to be replaced.

9-22

Rear brake

To check rear brake shoe wear, check the position

of the adjusting nut. If the nut is more than 18 mm

(0.71 in) from the end of the bolt, the brake shoes

need to be replaced.

1. Upper adjusting bolt

2. Lower adjusting bolt

3. No more than 12 mm (0.47 in)

1. Rear brake lever free play adjusting nut

2. Bolt

3. No more than 18 mm (0.71 in)

9-23

EBU24334

Adjusting the front brake lever free

play

Periodically check the front brake lever free play

and adjust if necessary.

1. Loosen the upper locknut and fully turn in the

upper adjusting bolt.

2. Loosen the lower locknut.

3. Turn the lower adjusting bolt in direction (a) to

increase the lever free play, and in direction

(b) to decrease it.

4. Tighten the lower locknut.

5. While applying the front brake, turn out the

upper adjusting bolt until the upper and lower

cable lengths are equal. The cable joint will

become vertical.

1. Front brake lever free play

Front brake lever free play:

20.0–25.0 mm (0.79–0.98 in)

1. Upper locknut

2. Upper adjusting bolt

3. Lower locknut

4. Lower adjusting bolt

(a)

(b)

9-24

6. Tighten the upper locknut.

TIP

After adjusting the brake lever free play, check the

front brake shoes for wear.

EBU33784

Adjusting the rear brake lever free play

Periodically check the rear brake lever free play

and adjust if necessary.

Turn the adjusting nut in direction (a) to increase

the brake lever free play, and in direction (b) to de-

crease it.

1. Cable joint

a´

a=a´

1. Rear brake lever free play

Rear brake lever free play:

30.0–40.0 mm (1.18–1.57 in)

9-25

TIP

After adjusting the brake lever free play, check the

rear brake shoes for wear.

EBU34014

Drive chain slack

The drive chain slack should be checked before

each ride and adjusted if necessary.

TIP

When checking and adjusting the drive chain

slack, there should be no weight on the ATV and

all tires must be touching the ground.

To check the drive chain slack

1. Place the ATV on a level surface.

2. Move the ATV back and forth to locate the

tightest portion of the drive chain, and then

measure the drive chain slack as shown.

3. If the drive chain slack is incorrect, adjust it as

follows.

To adjust the drive chain slack

1. Loosen the bolts and nuts.

1. Rear brake lever free play adjusting nut

(a)

(b)

Drive chain slack:

24.0–32.0 mm (0.94–1.26 in)

1. Drive chain slack

9-26

2. Loosen the rear brake lever free play adjust-

ing nut.

3. Loosen the locknut.

1. Bolt

1. Nut

1. Rear brake lever free play adjusting nut

1. Drive chain slack adjusting nut

2. Locknut

(a)

(b)

9-27

4. To tighten the drive chain, turn the drive chain

slack adjusting nut in direction (a). To loosen

the drive chain, turn the adjusting nut in direc-

tion (b) and push the rear wheels forward.

NOTICE: Improper drive chain slack will

overload the engine as well as other vital

parts of the ATV and can lead to drive

chain slippage or breakage. To prevent

this from occurring, keep the drive chain

slack within the specified limits. [ECB00543]

5. Tighten the locknut, and then the bolts and

nuts to their specified torques.

6. Adjust the rear brake lever free play. (See

page 9-24.)

EBU24886

Lubricating the drive chain

The drive chain must be cleaned and lubricated at

the intervals specified in the periodic maintenance

chart, otherwise it will quickly wear out, especially

when riding in dusty or wet areas. Service the

drive chain as follows.

NOTICE

ECB00562

The drive chain must be lubricated after wash-

ing the ATV or riding in the rain or wet areas.

Tightening torques:

Locknut:

22 N·m (2.2 kgf·m, 16 lb·ft)

Bolt:

45 N·m (4.5 kgf·m, 33 lb·ft)

Nut:

54 N·m (5.4 kgf·m, 40 lb·ft)

1. O-ring

9-28

1. Clean the drive chain with a drive chain clean-

er and a small soft brush. NOTICE: To pre-

vent damaging the O-rings, do not clean

the drive chain with steam cleaners, high-

pressure washers or inappropriate sol-

vents. [ECB00572]

2. Wipe the drive chain dry.

3. Thoroughly lubricate the drive chain with a

special O-ring chain lubricant. NOTICE: Do

not use engine oil or any other lubricants

for the drive chain, as they may contain

substances that could damage the O-

rings. [ECB00582]

EBU24905

Checking and lubricating the cables

The operation and the condition of all control ca-

bles should be checked before each ride, and the

cables and cable ends should be lubricated if nec-

essary. If a cable is damaged or does not move

smoothly, have a Yamaha dealer check or replace

it.

WARNING

EWB02582



 Inspect cables frequently and replace if

damaged. Corrosion can result when the ca-

ble sheaths become damaged, and cables

can also become frayed or kinked, which

could restrict the operation of controls and

lead to an accident or injury.



 Always make sure all control cables work

smoothly before you begin riding in cold

weather. If the control cables are frozen or

do not work smoothly, you could be unable

to control the ATV, which could lead to an

accident or collision.

EBU28703

Checking and lubricating the front and

rear brake levers

The operation of the front and rear brake levers

should be checked before each ride, and the lever

pivots should be lubricated if necessary.

Recommended lubricant:

Yamaha cable lubricant or other suitable

cable lubricant

Recommended lubricant:

Lithium-soap-based grease

9-29

Front brake lever

Rear brake lever

EBU24965

Checking the wheel hub bearings

The front and rear wheel hub bearings must be

checked at the intervals specified in the periodic

maintenance chart. If there is play in a wheel hub

or if a wheel does not turn smoothly, have a

Yamaha dealer check the wheel hub bearings.

EBU36392

Lubricating the front arm pivots

The front arm pivots must be lubricated at the in-

tervals specified in the periodic maintenance

chart.

Recommended lubricant:

Lithium-soap-based grease

9-30

TIP

For parts equipped with a grease nipple, use a

grease gun.

EBU28826

Lubricating the front knuckle pivots

The front knuckle pivots must be lubricated at the

intervals specified in the periodic maintenance

chart.

TIP

For parts equipped with a grease nipple, use a

grease gun.

EBU25096

Lubricating the steering shaft

The steering shaft must be lubricated by a

Yamaha dealer at the intervals specified in the pe-

riodic maintenance chart.

1. Grease nipple

Recommended lubricant:

Lithium-soap-based grease

1. Grease nipple

Recommended lubricant:

Lithium-soap-based grease

9-31

TIP

For parts equipped with a grease nipple, use a

grease gun.

EBU34022

Battery

This model is equipped with a 12-volt VRLA

(valve-regulated lead-acid) battery. There is no

need to check the electrolyte or to add distilled

water. However, the battery lead connections

need to be checked and tightened, and the bat-

tery terminals cleaned if corroded. If the battery

seems to have discharged, recharge it as soon as

possible.

TIP

 Wear gloves and eye protection in a ventilated

area away from sparks and open flames. Wash

hands after handling.

 It is recommended to have the battery serviced

by a Yamaha dealer.

WARNING

EWB02161

Battery electrolyte is poisonous and danger-

ous, as it contains sulfuric acid, which can

cause severe burns. Avoid contact with skin,

eyes or clothing. Always shield your eyes when

working near batteries.

Antidote:

EXTERNAL: Flush with water.

INTERNAL: Drink large quantities of water or

milk. Follow with milk of magnesia, beaten egg

or vegetable oil. Call a physician immediately.

EYES: Flush with water for 15 minutes and get

prompt medical attention.

Batteries produce explosive gases. Keep

sparks, flame, cigarettes or other sources of

ignition away. Ventilate when charging or using

in an enclosed space.

KEEP OUT OF REACH OF CHILDREN.

To remove the battery

1. Remove the seat. (See page 5-13.)

2. Unhook the battery band.

9-32

3. Disconnect the negative battery lead first,

then the positive battery lead by removing

their bolt. NOTICE: When removing the bat-

tery, the main switch must be off, and the

negative lead must be disconnected be-

fore the positive lead. [ECB01002]

4. Pull the battery out of its compartment.

NOTICE

ECB00622

Never attempt to open the battery or remove

the battery cell seals, as this would permanent-

ly damage the battery.

To charge the battery

 Confirm the recommended charging rate as

specified on the battery itself.

 Select a suitable charger and follow the manu-

facturer’s instructions.

NOTICE

ECB00933

To charge a VRLA (valve-regulated lead-acid)

battery, a special battery charger is required.

Using a conventional battery charger will dam-

age the battery.

To store the battery

 If the ATV will not be used for more than one

month, remove the battery, fully charge it, and

then place it in a cool, dry place.

 If the battery will be stored for more than two

months, check it at least once a month and fully

charge it if necessary.

1. Positive battery lead (red)

2. Negative battery lead (black)

3. Battery

4. Battery band

9-33

NOTICE

ECB00942



 Always keep the battery charged. Storing the

battery in a discharged state for an extended

period of time will cause permanent battery

damage.



 Do not store the battery in an excessively

cold or warm place [below freezing or above

30 °C (90 °F)].

To install the battery

1. Place the battery in its compartment.

2. Connect the positive battery lead first, then

connect the negative battery lead by installing

their bolt. NOTICE: When installing the bat-

tery, the main switch must be off, and the

positive lead must be connected before

the negative lead. [ECB01111]

3. Hook the battery band.

4. Install the seat. (See page 5-13.)

TIP

 Make sure the positive and negative battery

leads are installed as shown.

 Fully charge the battery before installing it.

1. Positive battery lead (red)

2. Negative battery lead (black)

9-34

EBU25248

Replacing the fuse

If an electrical problem is suspected, check the

fuse and replace it if necessary as follows.

NOTICE

ECB00641

To prevent accidental short-circuiting, turn off

the main switch when checking or replacing a

fuse.

1. Turn off all electrical systems. (See page 5-1.)

2. Remove the seat. (See page 5-13.)

3. Remove the blown fuse, and then install a

new fuse of the specified amperage.

WARNING! Always use a fuse of the spec-

ified rating, and never use a substitute ob-

ject in place of the proper fuse. An

improper fuse or a substitute object can

cause damage to the electrical system,

which could lead to a fire. [EWB02173]

4. Turn on the main switch and start the engine.

5. Install the seat.

6. If the fuse immediately blows again, have a

Yamaha dealer check the vehicle.

EBU34030

Removing a wheel

1. Place the ATV on a level surface.

2. Loosen the wheel bolts.

1. Fuse

2. Spare fuse

Specified fuse:

7.5 A

9-36

EBU25721

Troubleshooting

Although Yamaha ATVs receive a thorough in-

spection before shipment from the factory, trouble

may occur during operation. Any problem in the

fuel, compression, or ignition systems, for exam-

ple, can cause poor starting and loss of power.

The following troubleshooting chart represents a

quick and easy procedure for checking these vital

systems yourself. However, should your ATV re-

quire any repair, take it to a Yamaha dealer, whose

skilled technicians have the necessary tools, ex-

perience, and know-how to service the ATV prop-

erly.

Use only genuine Yamaha replacement parts. Im-

itation parts may look like Yamaha parts, but they

are often inferior, have a shorter service life and

can lead to expensive repair bills.

WARNING

EWB02281

Do not smoke when checking the fuel system.

Fuel can ignite or explode, causing severe inju-

ry or property damage. Make sure there are no

open flames or sparks in the area, including pi-

lot lights from water heaters or furnaces.

9-37

EBU25754

Troubleshooting chart

Check the fuel level in

the fuel tank.

1. Fuel

There is enough fuel.

There is no fuel.

Check the battery.

Supply fuel. The engine does not start.

Check the battery.

The engine does not start.

Check the ignition.

Operate the electric starter.

4. Compression

There is compression.

There is no compression.

The engine does not start. Have a Yamaha dealer check the ATV.

Have a Yamaha dealer check the ATV.

Remove the spark plug

and check the electrodes.

3. Ignition

Wipe off with a dry cloth and correct the

spark plug gap, or replace the spark plug.

Have a Yamaha dealer check the ATV. The engine does not start.

Check the compression.

Operate the electric starter.

2. Battery

The engine turns over

quickly.

The engine turns over

slowly.

The battery is good.

Check the battery lead connections,

and have a Yamaha dealer charge

the battery if necessary.

Dry

Wet Open the throttle halfway and operate

the electric starter.

10-1

EBU25861

CLEANING AND STORAGE

EBU25904

Cleaning

Frequent, thorough cleaning of your ATV will not

only enhance its appearance but will improve its

general performance and extend the useful life of

many components.

1. Before cleaning the ATV:

a. Block off the end of the exhaust pipe to

prevent water entry. A plastic bag and

strong rubber band may be used.

b. Make sure the spark plug and all filler caps

are properly installed.

2. If the engine case is excessively greasy, apply

degreaser with a paint brush. Do not apply

degreaser to the chain, sprockets or wheel

axles.

3. Rinse the dirt and degreaser off with a garden

hose. Use only enough pressure to do the

job. WARNING! Wet brakes may have re-

duced stopping ability, increasing the

chance of an accident. Test the brakes af-

ter washing. Apply the brakes several

times at slow speeds to let friction dry out

the linings. [EWB02312] NOTICE: Excessive wa-

ter pressure may cause water seepage

and deterioration of wheel bearings,

brakes, transmission seals and electrical

devices. Many expensive repair bills have

resulted from improper high-pressure de-

tergent applications such as those avail-

able in coin-operated car washers. [ECB00712]

4. Once most of the dirt has been hosed off,

wash all surfaces with warm water and mild,

detergent-type soap. An old toothbrush or

bottle brush is handy for hard-to-reach plac-

es.

5. Rinse the ATV off immediately with clean wa-

ter and dry all surfaces with a chamois, clean

towel or soft absorbing cloth.

6. Dry the chain and lubricate it to prevent it

from rusting.

7. Clean the seat with a vinyl upholstery cleaner

to keep the cover pliable and glossy.

8. Automotive type wax may be applied to all

painted and chrome plated surfaces. Avoid

combination cleaner-waxes. Many contain

10-2

abrasives which may mar the paint or protec-

tive finish. When finished cleaning, start the

engine and let it idle for several minutes.

9. If the headlight lens has fogged up, start the

engine and turn on the headlight to help re-

move the moisture.

EBU30362

Storage

Short-term

Always store your ATV in a cool, dry place and, if

necessary, protect it against dust with a porous

cover. NOTICE: Storing the ATV in a poorly ven-

tilated room or covering it with a tarp while it is

still wet, will allow water and humidity to seep

in and cause rust. To prevent corrosion, avoid

damp cellars, stables (because of the presence

of ammonia) and areas where strong chemi-

cals are stored. [ECB00722]

Long-term

Before storing your ATV for several months:

1. Make any necessary repairs and perform all

outstanding maintenance.

2. Follow all the instructions in the Cleaning sec-

tion of this chapter.

3. Fill up the fuel tank and add fuel stabilizer (Fu-

el Med Rx if available), and then run the en-

gine for 5 minutes to distribute the treated

fuel.

4. Turn the fuel cock lever off, and then drain the

carburetor float chamber by loosening the

drain bolt. Pour the drained fuel into the fuel

tank.

5. Perform the following steps to protect the en-

gine from internal corrosion.

a. Remove the spark plug cap and spark

plug.

b. Pour a teaspoonful of engine oil into the

spark plug bore.

c. Install the spark plug cap onto the spark

plug, and then place the spark plug on the

cylinder head so that the electrodes are

grounded. (This will limit sparking during

the next step.)

d. Turn the engine over several times with

the starter. (This will coat the cylinder wall

with oil.)

Specified amount:

7.5 ml per liter of fuel (1 oz per gallon)

10-3

e. Install the spark plug and the spark plug

cap.

6. Lubricate all control cables and the pivoting

points of all levers.

7. Put the frame on stands or blocks to raise all

wheels off the ground. (Alternatively, turn the

wheels each month to prevent the tires from

degrading in one spot.)

8. Cover the muffler outlet with a plastic bag to

prevent moisture from entering it.

9. Remove the battery and fully charge it. (See

page 9-31.)

11-1

EBU25964

SPECIFICATIONS

Dimensions:

Overall length:

1485 mm (58.5 in)

Overall width:

1020 mm (40.2 in)

Overall height:

955 mm (37.6 in)

Wheelbase:

1030 mm (40.6 in)

Ground clearance:

210 mm (8.3 in)

Weight:

Curb weight:

126.5 kg (279 lb)

Loading:

Maximum load:

82.0 kg (181 lb)

(Total weight of rider, cargo, accessories, and tongue)

Noise and vibration level:

Noise level (77/311/EEC):

73.0 dB(A) at 3500 r/min

Uncertainty of measurement:

0.4 dB(A)

Vibration on seat (EN1032, ISO5008):

1.5 m/s²

Uncertainty of measurement:

0.3 m/s²

Vibration on handle (EN1032, ISO5008):

5.2 m/s²

Uncertainty of measurement:

1.3 m/s²

Engine:

Combustion cycle:

4-stroke

Cooling system:

Air cooled

Valve train:

SOHC

Number of cylinders:

Single cylinder

Displacement:

90 cm³

Bore × stroke:

47.0 × 51.8 mm (1.85 × 2.04 in)

Starting system:

Electric starter and kickstarter

Engine oil:

Recommended brand:

SAE viscosity grades:

5W-30, 10W-30, 10W-40, 15W-40, 20W-40, 20W-50

Produkt Specifikationer

Mærke:	Yamaha
Kategori:	Quad
Model:	YFM90R (2023)

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