YAMAHA YFM250R-W 2009 Service Manual

4-23
4 2. Turn the adjusting nut in direction (a) to in-
crease the spring preload and thereby harden
the suspension, and in direction (b) to de-
crease the spring preload and thereby soften
the suspension.
TIP
A special wrench can be obtained at a Yamaha
dealer to make this adjustment.
The spring preload setting is determined by
measuring distance A, shown in the illustration.
The shorter distance A is, the higher the spring
preload; the longer distance A is, the lower thespring preload. With each complete turn of the
adjusting nut, distance A is changed by 1.5 mm
(0.06 in).
3. Tighten the locknut to the specified torque.
1. Locknut
2. Spring preload adjusting nut
12
(a)
(b)
1. Distance ASpring preload setting:
Minimum (hard):
Distance A = 220.0 mm (8.66 in)
Standard:
Distance A = 228.0 mm (8.98 in)
Maximum (soft):
Distance A = 232.0 mm (9.13 in)
1
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4-24
4
NOTICEECB00080Always tighten the locknut against the adjust-
ing nut, and then tighten it to the specifiedtorque.
Rebound damping force
Turn the adjusting dial in direction (a) to increase
the rebound damping force and thereby harden the
damping, and in direction (b) to decrease the re-
bound damping force and thereby soften the
damping.Tightening torque:
Locknut:
42 Nm (4.2 m·kgf, 30 ft·lbf)
1. Rebound damping force adjusting dialRebound damping setting:
Minimum (soft):
20 click(s) in direction (b)*
Standard:
12 click(s) in direction (b)*
Maximum (hard):
3 click(s) in direction (b)*
* With the adjusting screw fully turned in direc-
tion (a)
1
(a)
(b)
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4-25
4 Compression damping force
Turn the adjusting screw in direction (a) to increase
the compression damping force and thereby hard-
en the damping, and in direction (b) to decrease
the compression damping force and thereby soft-
en the damping.
NOTICEECB00090Never turn an adjusting mechanism beyondthe minimum and maximum settings.TIPAlthough the total number of clicks of a damping
force adjusting mechanism may not exactly match
the above specifications due to small differences in
production, the actual number of clicks always rep-
resents the entire adjusting range. To obtain a pre-
cise adjustment, it would be advisable to check the
number of clicks of each damping force adjusting
mechanism and to modify the specifications asnecessary.
1. Compression damping force adjusting screw
2. Position indicator marks
1 2 (a)
(b)
Compression damping setting:
Minimum (soft):
12 click(s) in direction (b)*
Standard:
7 click(s) in direction (b)*
Maximum (hard):
2 click(s) in direction (b)*
* With the adjusting screw fully turned in direc-
tion (a)
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4-26
4
WARNING
EWB02500Suspension components become hot during
operation. Never touch the compression
damping force adjusting screw, the rebound
damping force adjusting dial or the oil reser-
voir with your bare hand or skin until suspen-sion components have cooled.U33B70E0.book Page 26 Wednesday, June 11, 2008 1:38 PM

5-1
5
EBU19200
PRE-OPERATION CHECKS
EBU19223Pre-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.TIPThe 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.4-10, 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, 8-9
Front brakeCheck 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 reservoir, and add recommended brake
fluid to specified level if necessary.
Check hydraulic system for leakage. Correct if necessary.5-3, 8-21, 8-22, 8-24
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5-2
5
Rear brakeCheck 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 reservoir, and add recommended brake
fluid to specified level if necessary.
Check hydraulic system for leakage. Correct if necessary.5-3, 8-21, 8-22, 8-25
ClutchCheck operation, and correct if necessary.
Lubricate cable if necessary.
Check lever free play, and adjust if necessary.8-28
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, 8-20
Control cablesMake sure that operation is smooth. Lubricate if necessary. 8-32
Drive chainCheck chain slack, and adjust if necessary.
Check chain condition. Lubricate if necessary.5-4, 8-29, 8-31
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
Shift pedalMake sure that operation is smooth.
Correct if necessary.8-34
Brake pedal Make sure that operation is smooth. Lubricate pedal pivoting point if
necessary.8-34
Brake and clutch leversMake sure that operation is smooth. Lubricate lever pivoting points if
necessary.8-33
Chassis fastenersMake sure that all nuts, bolts and screws are properly tightened. 5-6
Instruments, lights and
switchesCheck operation, and correct if necessary. 5-6 ITEM ROUTINE PAGEU33B70E0.book Page 2 Wednesday, June 11, 2008 1:38 PM

5-3
5
EBU19540Fuel Make sure that there is sufficient fuel in the tank.
(See page 4-10.)
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 8-9.)
EBU19710Front and rear brakes Brake lever and brake pedal
Check that there is no free play in the brake le-
ver. If there is free play, have a Yamaha dealer
check the brake system.
Check for correct brake pedal height. (See page
8-25.) If the pedal height is incorrect, have a
Yamaha dealer adjust it.
Check the operation of the lever and pedal. They
should move smoothly and there should be a
firm feeling when the brakes are applied. If not,
have a Yamaha dealer check the brake system.
Brake fluid level
Check the brake fluid level. Add fluid if necessary.
(See page 8-22.)
Recommended brake fluid:
DOT 4
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5-4
5Brake fluid leakage
Check to see if any brake fluid is leaking out of the
pipe joints or brake fluid reservoirs. Apply the
brakes firmly for one minute. If there is any leak-
age, have a Yamaha dealer check the brake sys-
tem.
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 for wear. (See page 8-21.)
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 a
problem cannot be corrected by the adjust-
ment procedures provided in this manual, havea 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.EBU19770Drive chain Check the condition of the drive chain and check
the drive chain slack. Lubricate and adjust the
drive chain as necessary. (See page 8-29.)EBU28081Tires
WARNING
EWB02391Use 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/C9207
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5-5
5 Size:
AT21 x 7-10
Type:
Tubeless
Rear:
Manufacturer/model:
MAXXIS/M976
Size:
AT20 x 10-9
Type:
Tubeless

The tires should be set to the recommended
pressure:
Recommended tire pressure:
Front:
27.5 kPa (0.275 kgf/cm², 4.0 psi)
Rear:
27.5 kPa (0.275 kgf/cm², 4.0 psi)
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:
24.5 kPa (0.245 kgf/cm², 3.6 psi)
Rear:
24.5 kPa (0.245 kgf/cm², 3.6 psi)
Use no more than the following pressures
when seating the tire beads.
Maximum tire seating pressure:
Front:
250 kPa (2.5 kgf/cm², 36 psi)
Rear:
250 kPa (2.5 kgf/cm², 36 psi)
Higher pressures and fast inflation may
cause a tire to burst. Inflate the tires very
slowly and carefully.EBU19821Measuring 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.
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5-6
5
Set the tire pressure when the tires are cold. Set
the tire pressures to the following specifications:
EBU19830Tire wear limit Replace the tire when the tire groove decreases to
3 mm (0.12 in).EBU19840Chassis fasteners Make sure that all nuts, bolts and screws are prop-
erly tightened.EBU19850Instruments, lights and switches Check that all instruments, lights and switches are
working properly. Correct if necessary.
1. Low-pressure tire gaugeRecommended pressure:
Fro nt
27.5 kPa (0.275 kgf/cm², 4.0 psi)
Rear
27.5 kPa (0.275 kgf/cm², 4.0 psi)
Minimum:
Fro nt
24.5 kPa (0.245 kgf/cm², 3.6 psi)
Rear
24.5 kPa (0.245 kgf/cm², 3.6 psi)
1. Tire wear limit
U33B70E0.book Page 6 Wednesday, June 11, 2008 1:38 PM