2020 YAMAHA YFM90R Owners Manual

EBU17421
TABLE OF CONTENTS
LOCATION OF THE WARNING AND
SPECIFICATION LABELS .............................. 1-1
SAFETY INFORMATION ................................ 2-1
DESCRIPTION................................................ 3-1Left 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........................................................ 6-5UBD364E0.book Page 1 Monday, January 28, 2019 9:30 AM

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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Troubleshooting ........................................ 8-36
Troubleshooting chart ............................... 8-37
CLEANING AND STORAGE ........................... 9-1 Cleaning ...................................................... 9-1
Storage........................................................ 9-2
SPECIFICATIONS ........................................ 10-1
CONSUMER INFORMATION ....................... 11-1 Identification numbers .............................. 11-1
INDEX ........................................................... 12-1
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1-1
1
EBU29681
LOCATION OF THE WARNING AND SPECIFICATION LABELS
EBU36153Read 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
7
2
4
3
UBD364E0.book Page 1 Monday, January 28, 2019 9:30 AM

1-2
1
BD3-F816R-20
BD3-F816L-50
E10
E5
BW4-F817K-10
1
32
4
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1-3
1
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.
SHIZUOKA JAPANYAMAHA
BW4-F155A-00
7 6
5UBD364E0.book Page 3 Monday, January 28, 2019 9:30 AM

1-4
1
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.
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1-5
1
E10E5

**.* 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.
UBD364E0.book Page 5 Monday, January 28, 2019 9:30 AM