2009 YAMAHA YFM90R tire pressure

TABLE OF CONTENTS
SAFETY INFORMATION..............................1-1
LOCATION OF THE WARNING AND
SPECIFICATION LABELS............................2-1DESCRIPTION ..............................................3-1 Left view.....................................................3-1Right 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 ............................................ 4-7
Fuel tank cap ............................................ 4-8 Fuel ........................................................... 4-8
Fuel cock .............................................. 4-10
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
Tires .......................................................... 5-4
Measuring the tire pressure ...................... 5-5
Tire wear limit ........................................... 5-6
Chassis fasteners ..................................... 5-7
Instruments and switches ......................... 5-7
OPERATION................................................6-1 Starting a cold engine ............................... 6-1
Starting a warm engine ............................. 6-3
Engine break-in ........................................ 6-4
Parking ..................................................... 6-4
Parking on a slope ................................... 6-5
Accessories and loading .......................... 6-6
Vehicle speed limiter ................................. 4-4
Engine speed limiter plate.......................... 4-5 Kick starter
............................................. 4-12

1-3
1
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 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 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 slowly and be very cautious in order to re-
duce the chance of skidding or sliding out of con-
trol.Never operate an ATV in fast flowing water or in
water deeper than that recommended in this
manual. Remember that wet brakes may havereduced 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
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.
WARNING
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 ex-
haust pipe/muffler when refueling. Never re-
fuel while smoking, or in the vicinity of
sparks, open flames, or other sources of ig-
nition such as the pilot lights of water heat-
ers and clothes dryers. Gasoline can catch

9
Make sure that operation is smooth, and check cable free play.Lubricate cable and lever housing if necessary.
Control cablesMake sure that operation is smooth. Lubricate if necessary. 8-27
Wheels and tiresCheck wheel condition, and replace if damaged.Check tire condition and tread depth. Replace if necessary.Check air pressure. Correct if necessary. 5-4, 5-5, 5-6
Brake leversMake sure that operation is smooth. Lubricate lever pivoting points
if necessary. 8-27
Chassis fastenersMake sure that all nuts, bolts and screws are properly tightened. 5-7
Instruments and switchesCheck operation, and correct if necessary. 5-7
2
5-2
9
Throttle lever 5-4, 8-21
5
PAGE
ROUTINE
METIT
Fuel
Check fuel line for leakage. Correct if necessary . 4-8, 5-3Check A TV for oil leakage. Correct if necessary .5-3, 8-11
Final transmission oil
5-3, 8-14
Check ATV for oil leakage. Correct if necessary.
Front brake
Check operation, and correct if necessary.Lubricate cable if necessary .Check lever free play , and adjust if necessary. 5-3, 8-22, 8-23
Engine oil
Check fuel level in fuel tank, and add recommended fuel if neces-
sary.Check brake pads for wear, and replace if necessary.
Check brake fluid level in reservoir, and add recommended brake fluid to specified level if necessary.
Check hydraulic system for leakage. Correct if necessary. Check operation. If soft or spongy, have Yamaha dealer bleed
hydraulic system.
Rear brake 5-3, 8-25, 8-26
Check oil level in engine, and add recommended oil to specified
level if necessary.

5-5
5
Measuring the tire pressure Use the low-pressure tire gauge.TIPThe low-pressure tire gauge is included as stan-
dard equipment. Make two measurements of the
tire pressure and use the second reading. Dust or
dirt in the gauge could cause the first reading to beincorrect.
Size:
AT18 x 9-8
Type: Tubeless
The tires should be set to the recommend-
ed pressure:Recommended tire pressure: Front:25 kPa (3.6 psi) (0.25 kgf/cm
2)
Rear: 25 kPa (3.6 psi) (0.25 kgf/cm2)
Check and adjust tire pressures when
the tires are cold.Tire pressures must be equal on both
sides.
2)2)
Tire pressure below the minimum speci-
fied could cause the tire to dislodge from
the rim under severe riding conditions.Minimum tire pressure: Front:22 kPa (3.2 psi) (0.22 kgf/cm
Rear: 22 kPa (3.2 psi) (0.22 kgf/cmUse no more than the following pressures
when seating the tire beads.
Maximum tire seating pressure: Front:250 kPa (36 psi) (2.5 kgf/cm
2)
Rear: 250 kPa (36 psi) (2.5 kgf/cm2)
Higher pressures and fast inflation may
cause a tire to burst. Inflate the tires very
slowly and carefully.

5-6
Set the tire pressure when the tires are cold. Set
the tire pressures to the following specifications:
Tire wear limit Replace the tire when the tire groove decreases to
3 mm (0.12 in).
1. Low-pressure tire gauge
Recommended pressure:Front25 kPa (3.6 psi) (0.25 kgf/cm
2)
Rear 25 kPa (3.6 psi) (0.25 kgf/cm2)
Minimum: Front22 kPa (3.2 psi) (0.22 kgf/cm2)
22 kPa (3.2 psi) (0.22 kgf/cm2)
Rear
5
1

7-7
Do not operate at speeds too fast for your
skills or the conditions.Speed limiters
For riders less experienced with this model, the
throttle lever housing is equipped with a vehicle
speed limiter. This speed limiter keeps the throttle
from fully opening, even when the throttle lever is
pushed to the maximum. Turning in the adjusting
screw limits the maximum engine power available
and decreases the maximum speed of the ATV.
Turning in the adjusting screw decreases top speed,
and turning it out increases top speed.
(See pages 4-3 and 4-4.)
7
This model also has an engine speed limiter plate
to limit the amount of engine power available.
WARNING

Always use the size and type tires specified in
the Owner’s Manual for this ATV on page 5-4.
Always maintain proper tire pressure as de-
scribed in the Owner’s Manual on page 5-5.
Use of improper tires on this ATV, or operation
of this ATV with improper or uneven tire pres-
sure, may cause loss of control, increasingyour risk of an accident.
WARNING
Always go at a speed that is proper for the ter-
rain, visibility and operating conditions, and
your experience. Operating this ATV at speeds
too fast for your skills or the conditions in-
creases your chances of losing control of theATV, which can result in an accident.
Yamaha recommends that all beginning riders start
off with the vehicle speed limiter turned in and the
engine speed limiter plate installed to limit the amount
of speed available while they learn. The vehicle speed
limiter may be gradually adjusted to increase maximum
speed 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 plate will

8-1
PERIODIC MAINTENANCE AND MINOR REPAIR
Safety is an obligation of the owner. Periodic in-
spection, adjustment and lubrication will keep your
ATV in the safest and best operating condition
possible. The most important points of inspection,
adjustment, and lubrication are explained on the
following pages.
The intervals given in the periodic maintenance
and lubrication chart should be considered as a
general guide under normal riding conditions.
However, DEPENDING ON THE WEATHER,
TERRAIN, GEOGRAPHICAL LOCATION, AND
INDIVIDUAL USE, THE MAINTENANCE INTER-
VALS MAY NEED TO BE SHORTENED.
Owner’s manual and tool kit Be sure to put this owner’s manual in the plastic
bag and to always carry it as well as the owner’s
tool kit and the low-pressure tire gauge in their re-
spective compartments under the seat.
8
WARNING
Never service an engine while it is running.
Moving parts can catch clothing or parts of the
body, causing injury. Electrical components
can cause shocks or start fires. Turn off the en-
gine when performing maintenance unlessotherwise specified. Have a Yamaha dealer
perform the service if you are not familiar with
maintenance work.

8-2
it for you.
1. Owner ’s manual
2. Low-pressure tire gauge
3. Owner ’s tool kitThe service information included in this manual
and the tools provided in the owner’s tool kit are in-
tended to assist you in the performance of preven-
tive maintenance and minor repairs. However,
additional tools such as a torque wrench may be
necessary to perform certain maintenance work
correctly.
TIPIf you do not have the tools or experience required
for a particular job, have a Yamaha dealer perform
5TH-28199-66YFM90ROWNER'S MANUAL
1626-21-38This ATV
shoul
d not be ridden by anyone under
years.
e
g
a
f
o
WARNING
READ THIS MANUAL CAREFULLY!
It contains important safety information.
8
1
23
WARNING
Never modify this ATV through improper in-
stallation or use of accessories, as it may
cause changes in handling, which in some sit-
uations could lead to an accident. All parts and
accessories added to this ATV should be gen-
uine Yamaha or equivalent components de-
signed for use on this ATV and should be
installed and used according to instructions. If
you have questions, consult an authorizedYamaha ATV dealer.