2010 YAMAHA GRIZZLY 250 tires

7-12
7Select a large, flat, unpaved area to become famil-
iar with your ATV. Make sure that this area is free
of obstacles and other riders. You should practice
control of the throttle, brakes, shifting procedures,
and turning techniques in this area before trying
more difficult terrain.
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. As you
get on the ATV, be sure not to accidentally move
the shift pedal. With the engine idling, lift the shift
pedal to the 1st gear position and then release the
parking brake. Apply the throttle slowly and
smoothly. The centrifugal clutch will engage and
you will start to accelerate. Once the ATV has at-
tained adequate speed, release the throttle and lift
the shift pedal to the 2nd gear position. Release
the shift pedal and apply the throttle smoothly.
WARNING! If the throttle is applied too abruptly
or if the throttle is not released during shifting,
or if the shift pedal is not released before ap-
plying the throttle, the front wheels may lift off
the ground, resulting in a loss of directional
control.
[EWB02631]
NOTICE: Do not shift gears
without releasing the throttle. Damage to the
engine or drive train may occur.
[ECB01071]
Use this same procedure as you move into the
higher gears. Be sure to coordinate the use of the
throttle and shift pedal properly.
Avoid higher speeds until you are thoroughly famil-
iar with the operation of your ATV.
When slowing down or stopping, release the throt-
tle and apply the brakes smoothly and evenly. As
you slow down, shift to a lower gear. Be sure that
the engine has sufficiently slowed before engaging
a lower gear. Improper use of the brakes or shifting
can cause the tires to lose traction, reducing con-
trol and increasing the possibility of an accident.
TURNING YOUR ATV
WARNING
EWB01771Always follow proper procedures for turning
as described in this Owner’s Manual. Practice
turning at low speeds before attempting to turn
at faster speeds. Do not turn at speeds too fast
for your skills or the conditions. ATV could go
out of control, causing a collision or overturn.To achieve maximum traction on unpaved surfac-
es, the two rear wheels turn together at the same
speed. Therefore, unless the wheel on the inside
of the turn is allowed to slip or lose some traction,
U1P065E0.book Page 12 Monday, August 31, 2009 1:10 PM

7-18
7

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 tech-
nique as described in the Owner’s Manual on
level ground. Be very careful when turning
on any hill.Traversing a sloping surface on your ATV requires
you to properly position your weight to maintain
proper balance. Be sure that you have learned the
basic riding skills on flat ground before attempting
to cross a sloping surface. Avoid slopes with slip-
pery surfaces or rough terrain that may upset your
balance.
As you travel across a slope, lean your body in the
uphill direction. It may be necessary to correct the
steering when riding on loose surfaces by pointing
the front wheels slightly uphill. When riding on
slopes, be sure not to make sharp turns either up
or down hill.
If your ATV does begin to tip over, gradually steer
in the downhill direction if there are no obstacles in
your path. As you regain proper balance, gradually
steer again in the direction you wish to travel.CROSSING THROUGH SHALLOW WATER
WARNING
EWB01641Operating this vehicle through deep or fast-
flowing water can lead to loss of control or an
overturn. To reduce your risk of drowning or
other injuries, use care when crossing through
water. Never operate this ATV water deeper
than the depth specified in your Owner’s Man-
ual, as tires may float, increasing the risk of an
overturn.
U1P065E0.book Page 18 Monday, August 31, 2009 1:10 PM

8-6
8
5*Brake hosesCheck for cracks or other damage, and replace if
necessary.√√√√
Replace. Every 4 years
6*WheelsCheck runout and for damage, and replace if nec-
essary.√ √√√
7*TiresCheck tread depth and for damage, and replace if
necessary.
Check air pressure and balance, and correct if
necessary.√ √√√
8*Wheel hub bearingsCheck for looseness or damage, and replace if
necessary.√ √√√
9*Swingarm pivotsCheck operation and for excessive play, and re-
place bearings if necessary.
Lubricate with lithium-soap-based grease.√√√
10*Chassis fastenersMake sure that all nuts, bolts, and screws are
properly tightened.√√√√√
11*Shock absorber as-
sembliesCheck operation and correct if necessary.
Check for oil leakage and replace if necessary.√√√
12*Steering shaftLubricate with lithium-soap-based grease.√√√
13*Steering systemCheck operation and repair or replace if damaged.
Check toe-in and adjust if necessary.√√√√√ NO. ITEMCHECK OR MAINTENANCE
JOBINITIAL EVERY
Whichev-
er comes
firstmonth136612
km
(mi)320
(200)1300
(800)2500
(1600)2500
(1600)5000
(3200)
hours 20 80 160 160 320
U1P065E0.book Page 6 Monday, August 31, 2009 1:10 PM

9-3
9ly, 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 in-
formation on storing the battery, see page
8-38.
TIPMake any necessary repairs before storing the
ATV.U1P065E0.book Page 3 Monday, August 31, 2009 1:10 PM

10-3
10
Transmission type:
Constant mesh 5-speed.forward, 1-speed.reverse
Operation:
Left foot operation
Gear ratio:
1st:
34/12 (2.833)
2nd:
34/19 (1.789)
3rd:
29/22 (1.318)
4th:
26/25 (1.040)
5th:
23/28 (0.821)
Reverse gear:
73/22 × 34/12 × 19/18 (9.924)Chassis:Frame type:
Steel tube frame
Caster angle:
4.0 °
Trail:
20.0 mm (0.79 in)Front tire:Type:
Tubeless
Size:
AT22 x 7.00-10
Manufacturer/model:
YFM250Z CARLISLE/TRAIL WOLF
YFM25BZ MAXXIS/M905
Rear tire:Type:
Tubeless
Size:
AT22 x 10.00-10
Manufacturer/model:
YFM250Z CARLISLE/TRAIL WOLF
YFM25BZ MAXXIS/M906Loading:Maximum loading limit:
165.0 kg (364 lb)
(Total weight of rider, cargo, accessories, and tongue)Tire air pressure (measured on cold tires):Recommended:
Front:
20.0 kPa (0.200 kgf/cm², 2.9 psi)
Rear:
25.0 kPa (0.250 kgf/cm², 3.6 psi)
Minimum:
Front:
17.0 kPa (0.170 kgf/cm², 2.5 psi)
Rear:
22.0 kPa (0.220 kgf/cm², 3.2 psi)Front wheel:Wheel type:
Panel wheel
Rim size:
10 x 6.0ATRear wheel:Wheel type:
Panel wheel
U1P065E0.book Page 3 Monday, August 31, 2009 1:10 PM

MMain switch .................................................................... 4-1
Maintenance and lubrication chart ................................. 8-5
Maintenance chart, emission control system ................. 8-3
Model label ................................................................... 11-2NNeutral indicator light ..................................................... 4-2OOwner’s manual and tool kit ........................................... 8-1PParking ........................................................................... 6-7
Parking brake ................................................................. 4-6
Parking on a slope ......................................................... 6-7
Part locations ................................................................. 3-1RRecoil starter .................................................................. 4-7
Reverse indicator light .................................................... 4-2
Riding your ATV ............................................................. 7-1SSafety information .......................................................... 2-1
Seat .............................................................................. 4-11
Shifting ........................................................................... 6-4
Shift pedal ...................................................................... 4-6
Shift pedal, checking .................................................... 8-36
Shock absorber assembly, adjusting the rear .............. 4-14
Spark arrester, cleaning ............................................... 8-23
Spark plug, checking ...................................................... 8-9
Specifications ............................................................... 10-1
Speed limiter .................................................................. 4-4
Starter (choke) ............................................................. 4-11
Start switch ..................................................................... 4-3
Steering shaft, lubricating ............................................. 8-37Storage ........................................................................... 9-2
Storage compartment ................................................... 4-12
Swingarm pivots, lubricating ........................................ 8-37
TTail/brake light bulb, replacing ..................................... 8-45
Throttle cable free play, adjusting ................................ 8-26
Throttle lever ........................................................... 4-3, 5-4
Tires ............................................................................... 5-4
Troubleshooting ........................................................... 8-47
Troubleshooting chart .................................................. 8-48VValve clearance ............................................................ 8-27
Vehicle identification number ....................................... 11-1WWheel hub bearings, checking ..................................... 8-37
Wheel, installing ........................................................... 8-46
Wheel, removing .......................................................... 8-45
U1P065E0.book Page 2 Monday, August 31, 2009 1:10 PM