Yamaha YFM90RA User manual

This A
43D-F8199-12
OWNER’S MANUAL
LIT-11626-24-16
This ATV should not be ridden by anyone under 12 years of age.
WARNING
READ THIS MANUAL CAREFULLY!
It contains important safety information.
YFM90RA

Read this manual carefully before operating this vehicle.This manual should stay with this ve-
hicle if it is sold.

INTRODUCTION
Congratulations on your purchase of the YamahaYFM90RA.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 together with tips for the ATV rider carefully and completely before operating your ATV.
Make sure you understand all instructions.
Pay close attention to the warning and notice 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 70 cc, should not be operated by a child under 12 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 childrenmay 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. See the previous
page for information about the free training available to purchasers of new ATVs.

WARNING
NOTICE
TIP
This is the safety alert symbol. It is used to alert you to potential
personal injury hazards. Obey all safety messages that follow this
symbol to avoid possible injury or death.
damage to the vehicle or other property.
A TIP provides key information to make procedures easier or clearer.
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
IMPORTANT MANUAL INFORMATION
FAILURETOFOLLOWTHEWARNINGSCONTAINEDINTHISMANUALCANRESULTINSERIOUSIN-
JURY OR DEATH.
Particularly important information is distinguished in this manual by the following notations:
* Product and specifications are subject to change without notice.

IMPORTANT NOTICE
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.
YFM90RA
OWNER’S MANUAL
©2010 byYamaha Motor Corporation, U.S.A.
1st edition, July 2010
All rights reserved.
Any reprinting or unauthorized use
without the written permission of
Yamaha Motor Corporation, U.S.A.
is expressly prohibited.
Printed in Taiwan.
P/N LIT-11626-24-16

WARNING
Indicates a hazardous situation which, if not
avoided, could result in death or serious injury.
TABLE OF CONTENTS
SAFETY INFORMATION..............................2-1
LOCATION OF THE WARNING AND
SPECIFICATION LABELS............................1-1
DESCRIPTION ..............................................3-1
Left view.....................................................3-1
Right view...................................................3-1
Controls and instruments...........................3-2
INSTRUMENT AND CONTROL
FUNCTIONS..................................................4-1
Main switch...............................................4-1
Handlebar switches ................................... 4-2
Throttle lever ............................................. 4-3
Speed limiters............................................. 4-3
Front brake lever ......................................... 4-6
Rear brake lever ....................................... 4-6
Parking brake lever ................................... 4-7
Fuel tank cap ............................................ 4-8
Fuel ........................................................... 4-8
Fuel cock ............................................... 4-10
Tire information ........................................ 5-6
Aftermarket tires and rims......................... 5-7
Choke ..................................................... 4-11
Seat ........................................................ 4-11
PRE-OPERATION CHECKS.........................5-1
Pre-operation check list............................5-1
Fuel ........................................................... 5-3
Engine oil .................................................. 5-3
Final transmission oil ................................ 5-3
Front and rear brakes ............................... 5-3
Throttle lever ............................................. 5-4
Drive chain ................................................ 5-4
Tires .......................................................... 5-4
Tire pressure ............................................ 5-4
Tire wear limit .......................................... 5-6
Chassisfasteners .................................... 5-7
Instruments and switches ........................ 5-7
OPERATION................................................6-1
Starting a cold engine ............................... 6-1
Starting a warm engine ............................. 6-3
Kick starter ............................................. 4-12
Vehicle speed limiter ................................. 4-4
Engine speed limiter plate.......................... 4-5

Cleaning the spark arrester ...................... 8-19
Adjusting the carburetor ........................... 8-20
Adjusting the engine idling speed ............ 8-20
Checking the throttle cable free play ....... 8-21
Valve clearance ....................................... 8-22
Checking the front brake shoes................ 8-22
Adjusting the front brake lever free
Adjusting the parking brake free play ....... 8-24
play ....................................................... 8-23
Checking the rear brake pads ................. 8-26
Checking the brake fluid level ................. 8-26
Changing the rear brake fluid .................. 8-27
Checking the rear brake lever free
play ........................................................8-27
Drive chain slack ................................... 8-28
Lubricating the drive chain ...................... 8-29
Checking and lubricating the cables ....... 8-30
Checking and lubricating the front
and rear brake levers ............................. 8-30
Checking the wheel hub bearings ............ 8-31
Battery ..................................................... 8-31
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...........7-11
TURNING YOUR ATV..............................7-15
CLIMBING UPHILL....................................7-17
RIDING DOWNHILL..................................7-20
CROSSING A SLOPE................................7-21
CROSSING THROUGH SHALLOW
WATER................................................... 7-22
RIDING OVER ROUGH TERRAIN............7-24
SLIDING AND SKIDDING.........................7-25
WHAT TO DO IF.......................................7-26
WHAT TO DO........................................... 7-26
PERIODIC MAINTENANCE AND
ADJUSTMENT................................................8-1
Owner’s manual and tool kit ...................... 8-2
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 ................................................. 8-11
Final transmission oil ................................ 8-14
Cleaning the air filter elements.................. 8-15
Brakes ..................................................... 8-22
Engine break-in .......................................... 6-4
Parking.......................................................6-4
Parking on a slope ..................................... 6-5
Accessories and loading ............................ 6-6

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
SPECIFICATIONS .....................................10-1
CONSUMER INFORMATION.....................11-1
Identification numbers ............................ 11-1
CLEANING AND STORAGE .......................9-1
Cleaning .................................................... 9-1
Storage ..................................................... 9-2
Replacing the fuse .................................. 8-33
Removing a wheel .................................. 8-34
Installing a wheel .................................... 8-34
Troubleshooting ...................................... 8-35
Troubleshooting chart ............................. 8-36

LOCATION OF THE WARNING AND SPECIFICATION LABELS
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 replace-
ment label from your Yamaha dealer.
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SAFETY INFORMATION
AN ATV IS NOT A TOY AND CAN BE HAZARD-
OUS TO OPERATE.
An ATV handles differently from other vehicles, in-
cluding motorcycles and cars. A collision or roll-
over can occur quickly, even during routine
maneuvers such as turning and riding on hills or
over obstacles, if you fail to take proper precau-
tions.
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.Beginners
should receive training from a certified instruc-
tor. Contact an authorized ATV dealer or call 1-
800-887-2887 to find out about the training
courses nearest you.
Always follow the age recommendation:
– A child under 12 years old should never oper-
ate an ATV with engine size greater than 70 cc.
– A child under 16 years old should never oper-
ate an ATV with engine size greater than 90 cc.
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, park-
ing 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
shouldalsoweareyeprotection(gogglesorface
shield), gloves, boots, a long-sleeved shirt or a
jacket, and long pants.
Never consume alcohol or drugs before or while
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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.
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 footrests of the ATV during op-
eration.
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 sur-
faces. Shift your weight forward. Never open the
throttle suddenlyormakesuddengearchanges.
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 ve-
hicle 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 hillswithexcessivelyslipperyorloosesur-
faces. 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 tech-
nique described in this manual on level ground.

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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 checkfor 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 slowlyandbeverycautiousin ordertore-
ducethechanceofskiddingorslidingoutofcon-
trol.
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 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
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.
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.

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FORMORE INFORMATIONABOUTATV SAFETY,
call the Consumer Products Safety Commission
at 1-800-638-2772, or the A TV Distributor’s
Safety Hotline at 1-800-852-5344.
Avoid Carbon Monoxide Poisoning
All engine exhaust contains carbon monoxide, a
deadlygas.Breathingcarbon monoxidecancause
headaches, dizziness, drowsiness, nausea, con-
fusion, and eventually death.
CarbonMonoxideisacolorless, odorless,tasteless
gas which may be present even if you do not see
or smell any engine exhaust. Deadly levels of
WARNING
carbon monoxide can collect rapidly and you can
quickly be overcome and unable to save yourself.
Also, deadlylevels of carbonmonoxide canlinger
for hours or days in enclosed or poorly ventilated
areas. If you experience 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 win-
dows and doors, carbon monoxide can rapidly
reach dangerous levels.
Donotrunengineinpoorlyventilatedor partially
enclosed areas such as barns, garages, or car-
ports.
Do not run engine outdoors where engine exh-
austcanbedrawnintoabuildingthroughopen-
ings such as windows and doors.

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DESCRIPTION
Left view Right view
1. Fuel cock
2. Rear wheel
3. Footrest
4. Front wheel
1. Spark arrester
2. Seat
3. Footrest
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3-2
Controls and instruments
1. Rear brake lever
2. Parking brake lever
3. Front brake lever
4. Throttle lever
5. Main switch
6. Fuel tank cap
7. Handlebar switches
8. Choke
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TIP
The ATV you have purchased may differ slightly
from the figures shown in this manual.
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