Yamaha YFM90 2019 User manual

DIC183
YFM90R
OWNER’S MANUAL
MANUEL DU PROPRIÉTAIRE
MANUAL DEL PROPIETARIO
BD3-F8199-64
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.

DIC183
Original instructions
Notice originale
Manual original
PRINTED IN TAIWAN
2019.01
(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-F8199-64-E0
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Read this manual carefully before operating this vehicle. This manual should stay with this ve-
hicle if it is sold.
UBD364E0.book Page 1 Monday, January 28, 2019 9:30 AM

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INTRODUCTION
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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 techni-
ques 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.
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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.
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IMPORTANT MANUAL INFORMATION
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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
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IMPORTANT NOTICE
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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
©2020 by Yamaha Motor Co., Ltd.
1st edition, January 2019
All rights reserved.
Any reprinting or unauthorized use
without the written permission of
Yamaha Motor Co., Ltd.
is expressly prohibited.
Printed in Taiwan.
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TABLE OF CONTENTS
LOCATION OF THE WARNING AND
SPECIFICATION LABELS ..............................1-1
SAFETY INFORMATION ................................ 2-1
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
Indicator lights............................................. 4-1
Handlebar switches .................................... 4-2
Throttle lever ............................................... 4-2
Speed limiter ............................................... 4-3
Front brake lever ......................................... 4-5
Rear brake lever .......................................... 4-5
Parking brake .............................................. 4-5
Drive select lever......................................... 4-6
Kickstarter...................................................4-7
Fuel tank cap ..............................................4-8
Fuel .............................................................4-9
Fuel cock .................................................. 4-10
Starter (choke) ......................................... 4-12
Seat .......................................................... 4-13
Front shock absorbers ............................. 4-13
Rear shock absorber ................................ 4-15
PRE-OPERATION CHECKS .......................... 5-1
Fuel ............................................................. 5-3
Engine oil .................................................... 5-3
Transmission .............................................. 5-3
Front and rear brakes ................................. 5-3
Throttle lever............................................... 5-3
Drive chain.................................................. 5-3
Tires ............................................................ 5-3
Chassis fasteners ....................................... 5-6
Instruments and switches........................... 5-6
OPERATION .................................................. 6-1
Starting a cold engine................................. 6-1
Starting a warm engine............................... 6-3
Operating the drive select lever and
driving in reverse ...................................... 6-3
Engine break-in........................................... 6-4
Parking........................................................ 6-5
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Parking on a slope ......................................6-5
Accessories and loading.............................6-6
RIDING YOUR ATV ........................................7-1
GETTING TO KNOW YOUR ATV ................ 7-2
RIDE WITH CARE AND GOOD
JUDGMENT .............................................. 7-2
BE CAREFUL WHERE YOU RIDE...............7-9
TURNING YOUR ATV................................7-12
CLIMBING UPHILL ...................................7-13
RIDING DOWNHILL ..................................7-16
CROSSING A SLOPE................................7-17
CROSSING THROUGH SHALLOW
WATER....................................................7-18
RIDING OVER ROUGH TERRAIN .............7-20
SLIDING AND SKIDDING.......................... 7-20
WHAT TO DO IF........................................7-21
WHAT TO DO............................................7-22
PERIODIC MAINTENANCE AND
ADJUSTMENT................................................8-1
Owner’s Manual and tool kit ....................... 8-2
Periodic maintenance chart: Emission
control system ..........................................8-3
Periodic maintenance chart: General
maintenance and lubrication.....................8-5
Checking the spark plug .............................8-9
Engine oil .................................................. 8-10
Why Yamalube.......................................... 8-13
Transmission oil........................................ 8-14
Cleaning the air filter element ................... 8-15
Cleaning the spark arrester ...................... 8-18
Adjusting the carburetor ........................... 8-19
Adjusting the engine idling speed ............ 8-19
Adjusting the throttle lever free play......... 8-20
Valve clearance......................................... 8-21
Brakes....................................................... 8-21
Checking the front and rear brake
shoes ...................................................... 8-21
Adjusting the front brake lever free play... 8-23
Adjusting the rear brake lever free play.... 8-24
Drive chain slack....................................... 8-25
Lubricating the drive chain ....................... 8-27
Checking and lubricating the cables ........ 8-28
Checking and lubricating the front and
rear brake levers ..................................... 8-29
Checking the wheel hub bearings ............ 8-29
Lubricating the front arm pivots ............... 8-30
Lubricating the front knuckle pivots ......... 8-30
Lubricating the steering shaft ................... 8-31
Battery ...................................................... 8-31
Replacing the fuse.................................... 8-34
Removing a wheel .................................... 8-35
Installing a wheel ...................................... 8-35
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