2009 YAMAHA YFM90R tires

7-15
Do not ride in areas posted “no trespassing”.
Do not ride on private property without getting per-
mission.
Select a large, flat area off-road to become familiar
with your ATV. Make sure that this area is free of
obstacles and other riders. You should practice
control of the throttle, brakes, and turning tech-
niques in this area before trying more difficult ter-
rain. Always avoid riding on paved surfaces: the
ATV is designed for off-road use only, and han-
dling maneuvers are more difficult to perform on
pavement.
Set the parking brake and follow the instruction on
page 6-1 to start the engine. Once it has warmed
up you are ready to begin riding your ATV. Re-
7
member that the engine and exhaust pipe will be
hot when riding and afterwards; do not allow skin
or clothing to come in contact with these compo-
nents.
Apply the throttle slowly and smoothly. You will
start to accelerate. If the throttle is applied too
abruptly, the front wheels may lift off the ground,
resulting in a loss of directional control. Avoid
higher speeds until you are thoroughly familiar
with the operation of your ATV.
When slowing down or stopping, release the throt-
tle and apply the brakes smoothly and evenly. Im-
proper use of the brakes can cause the tires to lose
traction, reducing control and increasing the possi-
bility of an accident.
TURNING YOUR ATV
To achieve maximum traction while riding off-road,
the two rear wheels are mounted solidly on one
axle and turn together at the same speed. There-
fore, unless the wheel on the inside of the turn is al-
lowed to slip or lose some traction, the ATV will
resist turning. A special turning technique must be
used to allow the ATV to make turns quickly and
easily. It is essential that this skill be learned first at With the engine idling, release the parking brake.

7-23
carefully. Enter where there is no sharp drop off,
and avoid rocks or other obstacles which may be
slippery or upset the ATV. Drive slowly and care-
fully.Test your brakes after leaving the water. Do not
continue to ride your ATV without verifying that you
have regained proper braking ability.
7
WARNING
Never operate this ATV in fast flowing water or
in water deeper than that specified in your
Ow ner’ s 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 lin-
ings. If the ATV is operated through deep or
fast flowing water, the tires may float, causing
loss of traction and loss of control, whichcould lead to an accident.

8-5
General maintenance and lubrication chart NO.ITEM CHECK OR MAINTENANCE
JOB INITIAL
EVERY
Whichev- er comes rst month 1 3 6 6 12
km
(mi) 320
(200) 1300
(800) 2500
(1600) 2500
(1600) 5000
(3200)
hours 20 80 160 160 3201 *Timing chain
Check chain tension.Adjust if necessary. √
√ √ √
2 Air lter elementClean and replace if necessary. Every 20–40 hours (more often in wet or
dusty areas)
4 *Front brakeCheck operation and correct if necessary.Check brake lever free play and adjust if neces-
sary. √ √ √ √ √Replace brake shoes.
Whenever worn to the limit
7
*Wheels
Check runout and for damage, and replace if nec-
essary. √
√ √ √
8 *TiresCheck tread depth and for damage, and replace if
necessary.Check air pressure and balance, and correct if
necessary. √
√ √ √
8
5
*Rear brake
Check operation and correct if necessary.Check uid level and ATV for uid leakage, and
correct if necessary. √ √ √ √ √Replace brake pads.
Whenever worn to the limit
6 *Brake hosesCheck for cracks or other damage, and replace if
necessary. √ √ √ √Replace.
Every 4 years
3
*Clutch
Check operation.
√√ √ √

9-3
plug, and then place the spark plug on the
cylinder head so that the electrodes are
grounded. (This will limit sparking during
the next step.)
d. Turn the engine over several times with the starter. (This will coat the cylinder wall
with oil.)
e. Remove the spark plug cap from the spark plug, and then install the spark plug and
the spark plug cap.
6. Lubricate all control cables and the pivoting points of all levers and pedals.
7. Check and, if necessary, correct the tire air pressure, and then block up the ATV so that
all of its wheels are off the ground. Alternative-
ly, turn the wheels a little every month in order
to prevent the tires from becoming degraded
in one spot.
8. Cover the muffler outlet with a plastic bag to prevent moisture from entering it.
9. Remove the battery and fully charge it. Store it in a cool, dry place and charge it once a
month. Do not store the battery in an exces-
sively cold or warm place [less than 0 °C (30
°F) or more than 30 °C (90 °F)]. For more infor-
mation on storing the battery, see page 8-26.
TIPMake any necessary repairs before storing theATV.
9

10-3
10
Rear tire:Type:Tubeless
Size: AT18 x 9-8
Manufacturer/model: MAXXIS/M940Loading:Maximum loading limit: 70.0 kg (154 lb)
(Total weight of rider, cargo, accessories, and tongue)Tire air pressure (measured on cold tires):Recommended:Front:25 kPa (3.6 psi) (0.25 kgf/cm
2)
Rear: 25 kPa (3.6 psi) (0.25 kgf/cm2)
Minimum: Front:22 kPa (3.2 psi) (0.22 kgf/cm2)
Rear: 22 kPa (3.2 psi) (0.22 kgf/cm2)
Front wheel:
Wheel type: Panel wheel
Rim size: 8 x 5.5AT
Rear wheel:Wheel type: Panel wheel
Rim size: 8 x 7ATFront brake:Type:Drum brake
Operation: Right hand operationRear brake:Type:Single disc brake
Operation: Left hand operation
Recommended fluid: DOT4Front suspension:Type:Double wishbone
Spring/shock absorber type: Coil spring/oil damper
Wheel travel:
111 mm (4.4 in)

OOwner’s manual and tool kit ........................................... 8-1PParking ........................................................................\
... 6-4
Parking brake ................................................................. 4-7
Parking on a slope ......................................................... 6-5
Part locations ................................................................. 3-1
Pre-operation check list.................................................. 5-1RRiding your ATV ............................................................. 7-1SSafety information .......................................................... 1-1
Spark arrester, cleaning ............................................... 8-19
Spark plug, checking ...................................................... 8-9
Specifications .................................................................. 10-1
Start switch..................................................................... 4-2
Storage........................................................................\
... 9-2TThrottle cable free play, checking................................8-21
Throttle lever..........................................................4-3, 5-4
Timing chain.................................................................8-22
Tire pressure, measuring ............................................... 5-5
Tires ........................................................................\
....... 5-4
Tire wear limit ................................................................. 5-6
Troubleshooting...........................................................8-34
Troubleshooting chart..................................................8-35
VValve clearance............................................................ 8-22
Vehicle identification number ....................................... 11-1WWheel hub bearings, checking ..................................... 8-28
Wheel, installing ........................................................... 8-33
Wheel, removing .......................................................... 8-32
Seat ........................................................................\
...... 4-11 Vehicle speed limiter ...................................................... 4-4
Speed limiters.................................................................. 4-3