Yamaha YFM40FBX User Manual

READ THIS MANUAL CAREFULLY!

It contains important safety information.

OWNER’S MANUAL

YFM40FBX

WARNING

This ATV should not be ridden by anyone under 16 years of age.

4S1-F8199-11 LIT-11626-21-20

EBU17091

EBU17170

INTRODUCTION

EBU17270

Congratulations on your purchase of the Yamaha YFM40FBX. This ATV represents the result of many
years of Yamaha experience in the production of fine sporting, touring, and pace-setting 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 tech­niques 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 TOGETHER WITH TIPS FOR THE ATV RIDER CAREFULLY AND COMPLETE-

LY BEFORE OPERATING YOUR ATV. MAKE SURE YOU UNDERSTAND ALL INSTRUCTIONS.

● PAY CLOSE ATTENTION TO THE WARNING AND CAUTION LABELS ON THE ATV.

● NEVER OPERATE AN ATV WITHOUT PROPER TRAINING OR INSTRUCTION. FREE TRAINING IS

AVAILABLE TO ANYONE WHO BUYS A NEW ATV. CALL 1-800-887-2887 FOR MORE INFORMA­TION.

● THIS ATV, AND ANY OTHER ATV OVER 90 cc, SHOULD NOT BE RIDDEN BY ANYONE UNDER 16

YEARS OF AGE.

EBU17330

IMPORTANT MANUAL INFORMATION

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FAILURE TO FOLLOW THE WARNINGS CONTAINED IN THIS MANUAL CAN RESULT IN SERIOUS IN­JURY OR DEATH.
Particularly important information is distinguished in this manual by the following notations:

The Safety Alert Symbol means ATTENTION! BECOME ALERT! YOUR
SAFETY IS INVOLVED!

Failure to follow WARNING instructions could result in severe injury

WARNING

or death to the ATV operator, a bystander, or a person inspecting or
repairing the ATV.

CAUTION:

NOTE:

A CAUTION indicates special precautions that must be taken to avoid
damage to the ATV.

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

* Product and specifications are subject to change without notice.

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IMPORTANT NOTICE

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Welcome to the Yamaha world of motor sports!
This ATV is designed and manufactured for OFF-ROAD use only. It is illegal and unsafe to operate this ATV
on any public street, road or highway.
This ATV complies with all applicable OFF-ROAD noise level and spark arrester laws and regulations in
effect at the time of manufacture.
Please check your local riding laws and regulations before operating this ATV.

EBU17401

YFM40FBX

OWNER’S MANUAL

©2007 by Yamaha Motor Corporation, U.S.A.

1st edition, April 2007

AFFIX DEALER

LABEL HERE

Any reprinting or unauthorized use

without the written permission of

Yamaha Motor Corporation, U.S.A.

All rights reserved.

is expressly prohibited.

Printed in U.S.A.

P/N LIT-11626-21-20

EWB00010

WARNING

Indicates a potential hazard that could result
in serious injury or death.

EBU17420

TABLE OF CONTENTS

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

LOCATION OF THE WARNING AND

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

DESCRIPTION .............................................. 3-1

Left view ...................................................... 3-1

Right view.................................................... 3-1

Controls and instruments ............................ 3-2

Throttle lever .............................................4-10

Speed limiter .............................................4-11

Front brake lever .......................................4-12

Brake pedal and rear brake lever .............4-12

Parking brake ............................................4-13

Shift pedal .................................................4-14

Reverse knob “REV” .................................4-14

Recoil starter .............................................4-15

Fuel tank cap ............................................4-16

Fuel ...........................................................4-16

Fuel cock ..................................................4-17

Starter (choke) ..........................................4-19

Seat ..........................................................4-19

Storage compartment ...............................4-20

Front carrier ..............................................4-21

Rear carrier ...............................................4-21

Adjusting the front and

rear shock absorber assemblies .............4-21

Auxiliary DC jack .......................................4-23

INSTRUMENT AND

CONTROL FUNCTIONS................................ 4-1

Main switch ................................................ 4-1

Indicator lights and warning light ................ 4-2

Speedometer .............................................. 4-3

Fuel gauge ................................................. 4-4

Handlebar switches .................................... 4-5

PRE-OPERATION CHECKS ..........................5-1

Pre-operation check list ..............................5-1

Fuel .............................................................5-3

Engine oil ....................................................5-3

Final gear oil ...............................................5-3

Differential gear oil ......................................5-3

Front and rear brakes .................................5-3

Throttle lever .............................................. 5-4

Tires ........................................................... 5-5

Measuring the tire pressure ....................... 5-6

Tire wear limit ............................................. 5-7

Chassis fasteners ....................................... 5-7

Instruments, lights and switches ................ 5-7

CROSSING THROUGH

SHALLOW WATER .................................7-28

RIDING OVER ROUGH TERRAIN ............7-30

SLIDING AND SKIDDING .........................7-30

WHAT TO DO IF........................................7-31

WHAT TO DO............................................7-31

OPERATION .................................................. 6-1

Starting a cold engine ................................ 6-1

Starting a warm engine .............................. 6-3

Operating the reverse knob and

driving in reverse ...................................... 6-3

Shifting ....................................................... 6-4

Engine break-in .......................................... 6-6

Parking ....................................................... 6-7

Parking on a slope ..................................... 6-8

Accessories and loading ............................ 6-8

RIDING YOUR ATV ...................................... 7-1

GETTING TO KNOW YOUR ATV............... 7-2

RIDE WITH CARE AND

GOOD JUDGEMENT ................................ 7-2

BE CAREFUL WHERE YOU RIDE........... 7-12

TURNING YOUR ATV .............................. 7-18

CLIMBING UPHILL ................................... 7-20

RIDING DOWNHILL.................................. 7-24

CROSSING A SLOPE............................... 7-26

PERIODIC MAINTENANCE AND

MINOR REPAIR .............................................8-1

Owner’s manual and tool kit .......................8-1

Periodic maintenance chart

for the emission control system ................8-3

General maintenance and

lubrication chart ........................................8-5

Checking the spark plug .............................8-9

Engine oil and oil filter element .................8-11

Final gear oil .............................................8-15

Differential gear oil ....................................8-17

Cleaning the air filter element ...................8-20

Cleaning the spark arrester ......................8-23

Adjusting the carburetor ............................8-24

Adjusting the engine idling speed .............8-25

Adjusting the throttle cable free play .........8-26

Valve clearance ........................................8-26

Adjusting the reverse lock

release cable ..........................................8-27

Checking the front brake pads and

rear brake friction plates ......................... 8-27

Checking the brake fluid level .................. 8-28

Changing the brake fluid .......................... 8-29

Checking the front brake lever

free play ................................................. 8-29

Adjusting the brake pedal and

rear brake lever free play ....................... 8-30

Axle boots ................................................ 8-34

Brake light switches ................................. 8-35

Adjusting the clutch free play ................... 8-35

Checking and lubricating the cables ........ 8-36

Checking and lubricating the front and

rear brake levers .................................... 8-37

Checking and lubricating the brake and

shift pedals ............................................. 8-38

Checking the wheel hub bearings ............ 8-38

Lubricating the drive shaft

universal joint ......................................... 8-38

Checking the stabilizer bushes ................ 8-39

Lubricating the rear knuckle pivots ........... 8-39

Lubricating the steering shaft ................... 8-39

Battery ...................................................... 8-40

Replacing a fuse ...................................... 8-42

Replacing a headlight bulb ....................... 8-43

Adjusting a headlight beam ...................... 8-46

Replacing the tail/brake light bulb ............ 8-47

Removing a wheel ....................................8-48

Installing a wheel ......................................8-49

Troubleshooting ........................................8-50

Troubleshooting chart ...............................8-52

CLEANING AND STORAGE ..........................9-1

Cleaning ......................................................9-1

Storage .......................................................9-2

SPECIFICATIONS .......................................10-1

CONSUMER INFORMATION.......................11-1

Identification numbers ...............................11-1

Noise regulation ........................................11-3

Maintenance record ..................................11-4

YAMAHA MOTOR CORPORATION,

U.S.A. ATV LIMITED WARRANTY .........11-5

YAMAHA EXTENDED SERVICE

(Y.E.S.) ...................................................11-7

EBU17430

SAFETY INFORMATION

EBU17442

AN ATV IS NOT A TOY AND CAN BE HAZARD­OUS TO OPERATE.

An ATV handles differently from other vehicles, in­cluding motorcycles and cars. A collision or roll­over can occur quickly, even during routine
maneuvers such as turning and riding on hills or
over obstacles, if you fail to take proper precau­tions.
SEVERE INJURY OR DEATH can result if you do
not follow these instructions:

● Read this manual and all labels carefully and fol-

low the operating procedures described.

● Never operate an ATV without proper training or

instruction. Take a Training Course.
should receive training from a certified instruc­tor. Contact an authorized ATV dealer or call 1­800-887-2887 to find out about the training
courses nearest you.

● Always follow the age recommendation:

– A child under 16 years old should never oper­ate an ATV with engine size greater than 90 cc.

Beginners

1

● Never allow a child under age 16 to operate an

ATV without adult supervision, and never allow
continued use of an ATV by a child if he or she
does not have the abilities to operate it safely.

● Never carry a passenger on an ATV.

● Always avoid operating an ATV on any paved

surfaces, including sidewalks, driveways, park­ing lots and streets.

● Never operate an ATV on any public street, road

or highway, even a dirt or gravel one.

● Never operate an ATV without wearing an ap-

proved motorcycle helmet that fits properly. You
should also wear eye protection (goggles or face
shield), gloves, boots, a long-sleeved shirt or a
jacket, and long pants.

● Never consume alcohol or drugs before or while

operating this ATV.

● 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.

1-1

● Always inspect your ATV each time you use it to

make sure it is in safe operating condition. Al-

1

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 prac­ticed 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 ter­rain 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 backward.
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 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 stall­ing, use the proper gear and maintain a steady

1-2

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 up­hill. 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 obsta­cles 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 modify an ATV through improper installa-

tion or use of accessories.

● Never exceed the stated load capacity for an

ATV. Cargo should be properly distributed and
securely attached. Reduce speed and follow in­structions in this manual for carrying cargo or
pulling a trailer. Allow greater distance for brak­ing.

FOR MORE INFORMATION ABOUT ATV SAFE­TY, call the Consumer Products Safety Commis-

sion at 1-800-638-2772, or the ATV Distributor’s
Safety Hotline at 1-800-852-5344.

1

1-3

EWB00021

WARNING

1

POTENTIAL HAZARD
Improper handling of gasoline.
WHAT CAN HAPPEN
Gasoline can catch fire and you could be
burned.
HOW TO AVOID THE HAZARD
Always turn off the engine when refueling.
Do not refuel right after the engine has been
running and is still very hot.
Do not spill gasoline on the engine or ex­haust pipe/muffler when refueling.
Never refuel while smoking, or in the vicinity
of sparks, open flames, or other sources of
ignition such as the pilot lights of water
heaters and clothes dryers.
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.
WHAT CAN HAPPEN
Gasoline is poisonous and can cause inju­ries.

HOW TO AVOID THE HAZARD
If you should swallow some gasoline or in­hale a lot of gasoline vapor, or get some gas­oline in your eyes, seek medical help
immediately. If gasoline spills on your skin,
wash with soap and water. If gasoline spills
on your clothing, change your clothes.

EWB00030

WARNING

POTENTIAL HAZARD
Starting or running the engine in a closed ar­ea.

1-4

WHAT CAN HAPPEN
Exhaust fumes are poisonous and may
cause loss of consciousness and death
within a short time.
HOW TO AVOID THE HAZARD
Always operate your ATV in an area with ad­equate ventilation.

1

1-5

2

EBU17660

LOCATION OF THE WARNING AND SPECIFICATION LABELS

2-1

EBU17670

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 replace­ment label from your Yamaha dealer.

2

2-2

2-322-423-1

EBU17680

DESCRIPTION

EBU17690

Left view

3

1. Front shock absorber assembly spring preload adjusting
ring

2. Fuel cock

3. Recoil starter

4. Throttle stop screw

5. Fuses

6. Battery

7. Storage compartment and tool kit

8. Rear shock absorber assembly spring preload adjusting
ring

9. Clutch adjusting screw

10.Shift pedal

EBU17700

Right view

1. Spark arrester

2. Air filter case

3. Engine oil filler cap

4. Spark plug

5. Oil filter element

6. Brake pedal

7. Rear brake light switch

EBU17712

Controls and instruments

1. Rear brake lever

2. Parking brake lock plate

3. Starter (choke)

4. Speedometer

5. Reverse knob

6. Auxiliary DC jack

7. Front brake fluid reservoir

8. On-Command four-wheel-drive/differential gear lock
switch

9. Front brake lever

10.Throttle lever

11.Fuel gauge

12.Main switch

13.Handlebar switches

NOTE:

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

3

3-2

EBU17720

INSTRUMENT AND CONTROL FUNCTIONS

EWB00010

WARNING

Indicates a potential hazard that could result in
serious injury or death.

EBU17770

4

Main switch

The positions of the main switch are as follows:

ON

All electrical systems are supplied with power. The
headlights, meter lighting and taillight come on
when the light switch is on, and the engine can be
started. The key cannot be removed.

OFF

All electrical systems are off. The key can be re­moved.

1. Main switch

4-1

EBU17813

Indicator lights and warning light

1. Reverse indicator light “REVERSE”

2. Neutral indicator light “NEUTRAL”

3. Oil temperature warning light “”

4. On-Command differential gear lock indicator light “”

5. On-Command four-wheel-drive indicator light “”

EBU28331

Reverse indicator light “REVERSE”

This indicator light comes on when the transmis­sion is in the reverse position.
Furthermore, this indicator light flashes:

● when the override switch is being pushed,

● when the engine is being raced for 10 seconds

or more.

NOTE:

If the indicator light flashes under any other circum­stances or the speedometer does not show the
speed while riding, have a Yamaha dealer check
the speed sensor circuit.

EBU17870

Neutral indicator light “NEUTRAL”

This indicator light comes on when the transmis­sion is in the neutral position.

EBU26931

Oil temperature warning light “”

This warning light comes on when the engine over­heats. When this occurs, stop the engine as soon
as it is safe to do so, and allow it to cool.
The electrical circuit of the warning light can be
checked by turning the key to “ON”, with the engine
stop switch set to “”, and then pushing the start
switch.
If the warning light does not come on while the start
switch is being pushed, then go off after the start
switch is released, have a Yamaha dealer check
the electrical circuit.

4

4-2

If the warning light stays on, allow the engine to
cool. If the warning light stays on when the engine
is cool, have a Yamaha dealer check the electrical
circuit.

ECB00010

CAUTION:

● The engine may overheat if the ATV is over-

loaded. In this case, reduce the load to spec-

4

ification.

● Start the engine after making sure that the

warning light is out. Continuous use while
the warning light is on may cause damage to
the engine.

EBU17952

On-Command four-wheel-drive indicator light
“”

This indicator light comes on when the On-Com­mand four-wheel-drive switch is set to the “4WD”
position.

NOTE:

Due to the synchronizing mechanism in the differ­ential gear case, the light may not come on until
the ATV starts moving.

EBU28341

On-Command differential gear lock indicator
light “”

This indicator light and the On-Command four­wheel-drive indicator light “” come on when the
On-Command differential gear lock switch is set to
the “LOCK” position.

EBU18020

Speedometer

The speedometer shows the riding speed. This
speedometer is equipped with an odometer and a
tripmeter. The tripmeter can be reset to “0” with the
reset knob. Use the tripmeter to estimate how far
you can ride on a tank of fuel before going to re­serve. This information will enable you to plan fuel
stops in the future.

4-3

4

1. Reset knob

2. Speedometer

3. Odometer

4. Tripmeter

EBU18050

Fuel gauge

The fuel gauge indicates the amount of fuel in the
fuel tank. When the needle reaches the red line, re­fill the tank at the first opportunity.

1. Fuel gauge

2. Red line

NOTE:

If the ATV runs out of fuel, move the fuel cock lever
to the “RES” position. Approximately 4.0 L (1.06
US gal) (0.88 Imp.gal) of fuel will be remaining in
the tank.

4-4

EBU18061

Handlebar switches

4

1. Light switch “ / /OFF”

2. Start switch “”

3. Engine stop switch “ / ”

4. Override switch “OVERRIDE”

EBU18080

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 situation. The
engine will not start or run when this switch is set
to “”.

EBU18100

Start switch “”

Push this switch to crank the engine with the start­er.

ECB00050

CAUTION:

See the starting instructions on page 6-1 prior
to starting the engine.

EBU18160

Light switch “ //OFF”

Set this switch to “” to turn on the low beams,
the taillight and the meter lighting. Set the switch to
“” to turn on the high beams, the taillight and
the meter lighting. Set the switch to “OFF” to turn
off all the lights.

ECB00040

CAUTION:

Do not use the headlights with the engine
turned off for an extended period of time, oth­erwise the battery may discharge to the point
that the starter motor will not operate properly.
If this should happen, remove the battery and
recharge it.

4-5

EBU28350

Override switch “OVERRIDE”

1. Override switch “OVERRIDE”

Top speed is normally limited when operating in
differential gear lock. If conditions require more en­gine power when riding forward, push and hold this
switch to override the differential gear lock speed
limiting function. (See page 4-8.) Releasing the
switch restores the speed limiting function.
While the override switch is pushed, the reverse in­dicator light “REVERSE” will flash.

EWB00110

WARNING

POTENTIAL HAZARD
Riding too fast while the ATV is in four­wheel-drive differential gear lock.
WHAT CAN HAPPEN
All wheels turn at the same speed when the
differential is locked, so it takes more effort
to turn the ATV. The effort needed to turn in­creases with the riding speed. You may lose
control and have an accident if you cannot
make a sharp enough turn for the speed you
are traveling.
HOW TO AVOID THE HAZARD
Always ride at a slow speed when the ATV is
in four-wheel-drive differential gear lock, and
allow extra time and distance for maneuvers.

EBU28380

On-Command four-wheel-drive switch
“2WD”/“4WD”

This ATV is equipped with a switch to change from
two-wheel drive to four-wheel drive and vice-versa.
Select the appropriate drive according to the ter­rain and the conditions.

● “2WD” (two-wheel drive): Power is supplied to

the rear wheels.

4-6

4

● “4WD” (four-wheel drive): Power is supplied to

the rear and front wheels.
To change from two-wheel drive to four-wheel
drive, stop the ATV and push the switch in to the
“4WD” position. The four-wheel-drive indicator
light “” comes on.
To change from four-wheel drive to two-wheel
drive, stop the ATV and push the switch in to the

4

“2WD” position.

1. On-Command four-wheel-drive switch “2WD”/“4WD”

EWB00120

WARNING

POTENTIAL HAZARD
Changing from two-wheel drive to four­wheel drive or from four-wheel drive to two­wheel drive while the ATV is moving.
WHAT CAN HAPPEN
The ATV handles differently in two-wheel
drive than in four-wheel drive in some cir­cumstances. Changing from two-wheel drive
to four-wheel drive or from four-wheel drive
to two-wheel drive while moving may cause
the ATV to unexpectedly handle differently.
This could distract the operator and in­crease the risk of losing control and of caus­ing an accident.
HOW TO AVOID THE HAZARD
Always stop the ATV before changing from
two-wheel drive to four-wheel drive or vice­versa.

4-7

EBU28360

On-Command differential gear lock switch
“4WD”/“LOCK”

This ATV is equipped with a switch allowing you to
lock the differential gear when in four-wheel drive.
Select the appropriate switch position according to
the terrain and the conditions.

● “4WD” (four-wheel drive): Power is supplied to

the rear and front wheels.

● “LOCK” (four-wheel drive with the differential

gear locked): Power is supplied to the rear and
front wheels and the differential gear is locked.
Unlike in four-wheel drive, all wheels turn at the
same speed.

To lock the differential gear in four-wheel drive,
make sure the On-Command four-wheel-drive
switch is pushed in to the “4WD” position.

4

1. Differential gear lock lever

2. On-Command four-wheel-drive switch “2WD”/“4WD”

Stop the ATV, move the differential gear lock lever
to position (a), and then push the differential gear
lock switch in to the “LOCK” position. When the dif­ferential gear is locked, the differential gear lock in­dicator light “” comes on.

1. On-Command four-wheel-drive switch “2WD”/“4WD”

2. On-Command differential gear lock switch “4WD”/“LOCK”

4-8

4

1. On-Command differential gear lock switch “4WD”/“LOCK”

To release the differential gear lock, stop the ATV
and push the switch to the “4WD” position.

EWB00091

WARNING

POTENTIAL HAZARD
Changing from four-wheel drive to four­wheel-drive differential gear lock or vice-ver­sa while the ATV is moving.

WHAT CAN HAPPEN
The ATV handles differently in four-wheel
drive than in differential gear lock in some
circumstances. Changing from four-wheel
drive to differential gear lock or vice-versa
while moving may cause the ATV to handle
differently unexpectedly. This could distract
the operator and increase the risk of losing
control and causing an accident.
HOW TO AVOID THE HAZARD
Always stop the ATV before changing from
four-wheel drive to four-wheel-drive differen­tial gear lock or vice-versa.

EWB00101

WARNING

POTENTIAL HAZARD
Riding too fast while the ATV is in four­wheel-drive differential gear lock.
WHAT CAN HAPPEN
All wheels turn at the same speed when the
differential gear is locked, so it takes more
effort to turn the ATV. The effort needed to
turn increases with the riding speed. You
may lose control and have an accident if you
cannot make a sharp enough turn for the
speed you are traveling.

4-9

HOW TO AVOID THE HAZARD
Always ride at a slow speed when the ATV is
in differential gear lock, and allow extra time
and distance for maneuvers.

NOTE:

● If the differential gear lock is not engaging prop-

erly, turn the handlebar back and forth to help it
engage.

● Riding before the differential gear lock is proper-

ly engaged will cause the engine speed to be
limited until engagement is complete.

● When the ATV is in four-wheel-drive differential

gear lock, the maximum traveling speed is limit­ed to 31 km/h (19 mi/h). However, if conditions
require full engine power to be available, push
and hold the override switch to disable the differ­ential gear lock speed limiter. (See page 4-6 for
a detailed explanation of this switch.)

EBU18270

Throttle lever

Once the engine is running, movement of the throt­tle lever will increase the engine speed.

Regulate the speed of the ATV by varying the
throttle position. Because the throttle is spring­loaded, the ATV will decelerate, and the engine will
return to an idle any time the hand is removed from
the throttle lever.

4

1. Throttle lever

Before starting the engine, check the throttle to be
sure it is operating smoothly. Make sure it returns
to the idle position as soon as the lever is released.

4-10

EWB00200

WARNING

POTENTIAL HAZARD
Malfunction of throttle.
WHAT CAN HAPPEN
The throttle could be hard to operate, mak­ing it difficult to speed up or slow down
when you need to. This could cause an acci-

4

dent.
HOW TO AVOID THE HAZARD
Check the operation of the throttle lever be­fore you start the engine. If it does not work
smoothly, check for the cause. Correct the
problem before riding the ATV. Consult a
Yamaha dealer if you can’t find or solve the
problem yourself.

EBU18311

Speed limiter

Your ATV was delivered with an adjustable speed
limiter. The speed limiter keeps the throttle from
fully opening, even when the throttle lever is
pushed to the maximum.

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 de-

crease the maximum engine power available
and the maximum speed of the ATV, turn the
adjusting screw in direction (b).

1. Locknut

2. Adjusting screw

3. No more than 12 mm (0.47 in)

3. Tighten the locknut.

EWB00190

WARNING

POTENTIAL HAZARD
Improper adjustment of the speed limiter
and throttle.

4-11