2008 YAMAHA GRIZZLY 350 Owners Manual

4-18
4
NOTE:A special wrench can be obtained at a Yamahadealer to make this adjustment.1. Spring preload adjusting ring
2. Position indicator
1. Special wrenchSpring preload setting:
Minimum (soft):
1
Standard:
2
Maximum (hard):
5

4-19
4
WARNING
EWB00400Always adjust the shock absorber assemblies
on the left and right side to the same setting.
Uneven adjustment can cause poor handling
and loss of stability, which could lead to an ac-cident.EBU19020Adjusting the rear shock absorber as-
sembly The spring preload can be adjusted to suit the rid-
er’s weight and the riding conditions.
Adjust the spring preload as follows.
Turn the adjusting ring in direction (a) to increase
the spring preload and thereby harden the suspen-
sion, and in direction (b) to decrease the spring
preload and thereby soften the suspension.
NOTE:A special wrench can be obtained at a Yamahadealer to make this adjustment.1. Spring preload adjusting ring
2. Position indicator

4-20
4
EBUM0150Catalytic converter This model is equipped with a catalytic converter in
the exhaust system.
WARNING
EWBM0010The exhaust system is hot after operation.
Make sure that the exhaust system has cooleddown before doing any maintenance work.CAUTION:ECBM0010The following precautions must be observed to
prevent a fire hazard or other damages.
Use only unleaded gasoline. The use of lead-
ed gasoline will cause unrepairable damage
to the catalytic converter.
Never park the vehicle near possible fire haz-
ards such as grass or other materials that
easily burn.
Do not allow the engine to idle too long.
1. Special wrenchSpring preload setting:
Minimum (soft):
1
Standard:
2
Maximum (hard):
5

5-1
5
EBU19200
PRE-OPERATION CHECKS
EBU19222Pre-operation check list Before operating this ATV, be sure to check the items listed in the following table.
WARNING
EWB00480Always inspect your ATV each time you use it to make sure it is in safe operating condition.
Always follow the inspection and maintenance procedures and schedules described in the Owner’sManual. Failure to inspect increases the possibility of an accident or equipment damage.NOTE:The maintenance of some items in the table has to be performed by a Yamaha dealer. Refer to the periodicmaintenance charts on page 8-3 to determine which service should be performed by a Yamaha dealer.
ITEM ROUTINE PAGE
FuelCheck fuel level in fuel tank, and add recommended fuel if neces-
sary.
Check fuel line for leakage. Correct if necessary.4-11, 5-3
Engine oilCheck oil level in engine, and add recommended oil to specified lev-
el if necessary.
Check ATV for oil leakage. Correct if necessary.5-3, 8-11
Differential gear oil (for
four-wheel-drive models)Check ATV for oil leakage. Correct if necessary. 5-3, 8-18
Final gear oilCheck ATV for oil leakage. Correct if necessary. 5-3, 8-15

5-2
5
Hydraulic brake systemCheck operation. If soft or spongy, have Yamaha dealer bleed hy-
draulic system.
Check brake pads for wear, and replace if necessary.
Check brake fluid level in reservoirs, and add recommended brake
fluid to specified level if necessary.
Check hydraulic system for leakage. Correct if necessary.5-3, 8-26, 8-27, 8-29
Rear brakeCheck operation, and correct if necessary.
Lubricate cables if necessary.
Check lever and pedal free play, and adjust if necessary.5-3, 8-26, 8-29
Throttle leverMake sure that operation is smooth. Lubricate cable and lever hous-
ing if necessary.
Check cable free play, and adjust if necessary.5-4, 8-25
Control cablesMake sure that operation is smooth. Lubricate if necessary. 8-32
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 pedal Make sure that operation is smooth. Lubricate pedal pivoting point if
necessary.8-33
Brake leversMake sure that operation is smooth. Lubricate lever pivoting points if
necessary.8-32
Axle bootsCheck for cracks or damage, and replace if necessary. 8-31
Chassis fastenersMake sure that all nuts, bolts and screws are properly tightened. 5-7
Instruments, lights and
switchesCheck operation, and correct if necessary. 5-7 ITEM ROUTINE PAGE

5-3
5
EBU19540Fuel Make sure that there is sufficient fuel in the tank.
(See page 4-11.)
WARNING
EWB00520
Do not overfill the fuel tank. Fuel expands
when it heats up. If the fuel tank is overfilled,
fuel could spill out due to heat from the en-
gine or the sun.
Be careful not to spill fuel, especially on the
engine or exhaust pipe which can cause a
fire and severe injury. Wipe up any spilled
fuel immediately.
Do not refuel right after the engine has been
running and is still very hot.
Be sure the fuel tank cap is closed securely.EBU19560Engine oil Make sure that the engine oil is at the specified lev-
el. Add oil as necessary. (See page 8-11.)EBU19590Final gear oil Make sure that the final gear oil is at the specified
level. Add oil as necessary. (See page 8-15.)
EBU19600Differential gear oil (4WD model)Make sure that the differential gear oil is at the
specified level. Add oil as necessary. (See page
8-18.)EBUM0061Front and rear brakes Brake levers and brake pedal
Check that there is no free play in the front brake
lever. If there is free play, have a Yamaha dealer
check the brake system.
Check for correct free play in the rear brake lever
and brake pedal. If the free play is incorrect, ad-
just it. (See page 8-29.)
Check operation of the levers and pedal. They
should move smoothly and there should be a
firm feeling when the brake is applied. If not,
have a Yamaha dealer check them.
Brake fluid level (front brake and brake equal-
izer system)
Check the brake fluid level. Add fluid if necessary.
(See page 8-27.)

5-4
5 Brake fluid leakage (front brake and brake
equalizer system)
Check to see if any brake fluid is leaking out of the
hoses, joints or brake fluid reservoirs of the front
brake and brake equalizer system. Apply the brake
firmly for one minute. If the lever moves slowly in-
ward, there may be a leak in the brake system. If
there is any leakage, the brake system should be
checked by a Yamaha dealer.
Brake operation
Test the brakes at slow speed after starting out to
make sure they are working properly. If the brakes
do not provide proper braking performance, check
the brake pads and shoes for wear. (See page
8-26.)
WARNING
EWB00580Always check the brakes at the start of every
ride. Do not ride the ATV if you find any prob-
lem with the brakes or you could lose braking
ability, which could lead to an accident. If aproblem cannot be corrected by the adjust-
ment procedures provided in this manual, have
a Yamaha dealer check for the cause.EBU19761Throttle lever Check the operation of the throttle lever. It must
open smoothly and spring back to the idle position
when released. Have a Yamaha dealer correct if
necessary.EBU28080Tires
WARNING
EWB02390Use of improper tires on this ATV, or operation
of this ATV with improper or uneven tire pres-
sure, may cause loss of control, increasing
your risk of accident.
Pay attention to the following.
The tires listed below have been approved
by MBK INDUSTRIE for this model. Other tire
combinations are not recommended.
Front:
Manufacturer/model:
MAXXIS/M911Y Recommended brake fluid:
DOT 4

5-5
5Size:
AT25 x 8-12 31J
Type:
Tubeless
Rear:
Manufacturer/model:
MAXXIS/M912Y
Size:
AT25 x 10-12 38J
Type:
Tubeless

The tires should be set to the recommended
pressure:
Recommended tire pressure:
Front:
25.0 kPa (3.6 psi) (0.250 kgf/cm²)
Rear:
25.0 kPa (3.6 psi) (0.250 kgf/cm²)
Check and adjust tire pressures when the
tires are cold.
Tire pressures must be equal on both
sides.
Tire pressure below the minimum speci-
fied could cause the tire to dislodge from
the rim under severe riding conditions.Minimum tire pressure:
Front:
22.0 kPa (3.2 psi) (0.220 kgf/cm²)
Rear:
22.0 kPa (3.2 psi) (0.220 kgf/cm²)
Use no more than the following pressures
when seating the tire beads.
Maximum tire seating pressure:
Front:
250 kPa (36 psi) (2.5 kgf/cm²)
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.EBU19820Measuring the tire pressure Use the low-pressure tire gauge.NOTE:The 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.