YAMAHA YFM90R 2021 User Guide

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
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1
EBU38860
VEHICLE IDENTIFICATION
EBU28205Identification numbersRecord the vehicle identification number and
model label information in the spaces provided
below.
VEHICLE IDENTIFICATION NUMBER:
MODEL LABEL INFORMATION:EBU26032Vehicle identification number
The vehicle identification number is stamped into
the frame. This 17-digit number is used to identify
your individual ATV.
EBU26053Model label
The model label is affixed at the location shown.1. Vehicle identification number
1
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1
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
1
*
****
-
***1
3
2
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2
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
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2
BD3-F816R-20
BD3-F816L-50
E10
E5
BW4-F817K-10
1
32
4
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2
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
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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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2
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.
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EBU17432
SAFETY INFORMATION
SAFETY INFORMATION
EBU34093AN 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 to find
out about the training courses nearest you.
 Never allow a child under 10 years old to oper-
ate this ATV.
 Never allow a child under 16 years old to oper-
ate an ATV without adult supervision. 
Do not allow continued use of the ATV by a child
if he or she does not have the abilities to operate
it safely.
 Never carry a passenger on an ATV.
 This vehicle is intended for off-road use only. Do
not operate on any paved surfaces such as:
sidewalks, driveways, parking lots, paved
roads, public streets or other motorway.
 Watch carefully for other vehicles when operat-
ing on unpaved public streets or roads. Make
sure you know your country’s laws and regula-
tions before you ride on unpaved public streets
or roads.
 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
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3
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
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