lock YAMAHA YFM250R-W 2011 User Guide

4-17
4 spring 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.
NOTICEECB00080Always tighten the locknut against the adjust-
ing nut, and then tighten it to the specifiedtorque.
Rebound damping force
Turn the adjusting screw 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. Spring preload setting:
Minimum (hard):
Distance A = 197.6 mm (7.78 in)
Standard:
Distance A = 206.0 mm (8.11 in)
Maximum (soft):
Distance A = 209.6 mm (8.25 in)
1. Distance A
1
Tightening torque:
Locknut:
42 Nm (4.2 m·kgf, 30 ft·lbf)
U33B70E0.book Page 17 Wednesday, June 11, 2008 1:38 PM

4-20
4
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.
WARNING
EWB02490
Suspension components become hot during
operation. Never touch the compression
damping force adjusting bolt and screw, the
rebound damping force adjusting screw or
the oil reservoir with your bare hand or skin
until suspension components have cooled.
Always adjust the shock absorber assem-
blies on the left and right side to the same
setting.

Uneven adjustment can cause poor handling
and loss of stability, which could lead to anaccident.EBU28240Adjusting the rear shock absorber as-
sembly (YFM250R-W)The spring preload can be adjusted to suit the rid-
er’s weight and the riding conditions.
Adjust the spring preload as follows.
1. Loosen the locknut.
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.
U33B70E0.book Page 20 Wednesday, June 11, 2008 1:38 PM

4-21
4
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 the
spring preload. With each complete turn of the
adjusting nut, distance A is changed by 1.0 mm(0.04 in).
NOTICEECB00090Never turn an adjusting mechanism beyondthe minimum and maximum settings.
3. Tighten the locknut to the specified torque.NOTICEECB00080Always tighten the locknut against the adjust-
ing nut, and then tighten it to the specifiedtorque.
1. Locknut
2. Spring preload adjusting nut
3. Distance A
2
1
(b) 3(a)
Spring preload setting:
Minimum (hard):
Distance A = 222 mm (8.74 in)
Standard:
Distance A = 230 mm (9.06 in)
Maximum (soft):
Distance A = 234 mm (9.21 in)
Tightening torque:
Locknut:
42 Nm (4.2 m·kgf, 30 ft·lbf)
U33B70E0.book Page 21 Wednesday, June 11, 2008 1:38 PM

4-22
4
WARNING
EWB00450This shock absorber assembly contains highly
pressurized nitrogen gas. If the shock absorb-
er assembly is damaged, it could explode
causing injury or property damage. Shock ab-
sorber cylinder damage could also result in
poor handling which could cause an accident.
Do not tamper with or attempt to open the
cylinder assembly.
Do not subject the shock absorber assembly
to an open flame or other high heat.
Do not deform or damage the cylinder in any
way.
Do not dispose of a damaged or worn out
shock absorber assembly yourself. Take the
shock absorber assembly to a Yamaha deal-er for any service.EBU29310Adjusting the rear shock absorber as-
sembly (YFM250RSE-W)The spring preload, rebound damping and com-
pression damping forces of the rear shock absorb-
er assembly can be adjusted to suit the rider’s
weight and the riding conditions.
WARNING
EWB00430This shock absorber assembly contains highly
pressurized nitrogen gas. Read and under-
stand the following information before han-
dling the shock absorber assembly.
Do not tamper with or attempt to open the
cylinder assembly.
Do not subject the shock absorber assembly
to an open flame or other high heat source.
This may cause the unit to explode due to ex-
cessive gas pressure.
Do not deform or damage the cylinder in any
way. Cylinder damage will result in poor
damping performance.
Do not dispose of a damaged or worn out
shock absorber assembly yourself. Take the
shock absorber assembly to a Yamaha deal-er for any service.
Spring preload
1. Loosen the locknut.
U33B70E0.book Page 22 Wednesday, June 11, 2008 1:38 PM

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
U33B70E0.book Page 23 Wednesday, June 11, 2008 1:38 PM

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)
U33B70E0.book Page 24 Wednesday, June 11, 2008 1:38 PM

6-6
6
EBU20860Parking on a slope
WARNING
EWB00850Avoid parking on hills or other inclines. Park-
ing on a hill or other incline could cause the
ATV to roll out of control, increasing the
chance of an accident. If you must park on an
incline, place the ATV transversely across the
incline, shift into first gear, stop the engine, ap-
ply the parking brake, and then block the front
and rear wheels with rocks or other objects.Do not park the ATV at all on hills that are so
steep you could not walk up them easily.
1. Bring the ATV to a stop by applying the brakes
in first gear.
2. Stop the engine and release the clutch lever.
3. With the rear brake applied, apply the parking
brake and slowly release the brake pedal.
1. Locked position
1
U33B70E0.book Page 6 Wednesday, June 11, 2008 1:38 PM

7-6
7Speed limiter
For riders less experienced with this model, the
throttle lever housing is equipped with a speed lim-
iter. The 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 de-
creases the maximum speed of the ATV. Turning
in the adjusting screw decreases top speed, and
turning it out increases top speed. (See page 4-5.)Loading and accessories
As originally equipped, this ATV is not designed to
carry cargo or tow a trailer. If you choose to add ac-
cessories so that you can carry cargo or tow a trail-
er, you must use common sense and good
judgment.
Use extra caution when riding the ATV with addi-
tional loads, such as accessories or cargo. The
ATV’s handling may be adversely affected. Re-
duce your speed when adding additional loads.
WARNING
EWB01460
Never exceed the stated load capacity for
this ATV.
Cargo should be properly distributed and se-
curely attached.
Reduce speed when carrying cargo or pull-
ing a trailer. Allow greater distance for brak-
ing.
1. Adjusting screw
2. Locknut
2
1
MAXIMUM LOADING LIMIT
ATV loading limit (total weight of cargo, rider,
accessories, and tongue):
100.0 kg (220 lb)
U33B70E0.book Page 6 Wednesday, June 11, 2008 1:38 PM

7-17
7 If you start to roll backwards, DO NOT apply the
brake pedal to stop or try to put the ATV in gear.
The ATV could easily tip over backwards. Instead,
apply the front brake gradually, or dismount the
ATV immediately on the uphill side.
WARNING
EWB02410Use the proper gear and maintain a steady
speed when climbing a hill.
If you lose all forward speed:
Keep weight uphill.
Apply the brakes.
Lock the parking brake after you are
stopped.
If you begin rolling backwards:
Keep weight uphill.
Never apply the brake pedal while rolling
backwards. Apply the front brake.
When fully stopped, apply the brake pedal as
well, and then lock the parking brake.
Dismount on uphill side or to a side if pointed
straight uphill. Turn the ATV around and re-
mount, following the procedure described inthe Owner’s Manual.RIDING DOWNHILL
When riding your ATV downhill, shift your weight
as far to the rear and uphill side of the ATV as pos-
sible. Move back on the seat and sit with your arms
straight. Choose a low gear which will allow the en-
gine compression to do most of the braking for you.
Improper braking may cause a loss of traction.
Use caution while descending a hill with loose or
slippery surfaces. Braking ability and traction may
be adversely affected by these surfaces. Improper
braking may also cause a loss of traction.U33B70E0.book Page 17 Wednesday, June 11, 2008 1:38 PM

8-20
8
EBU24045Adjusting the throttle cable free play The throttle cable free play should be checked
and, if necessary, adjusted at the intervals speci-
fied in the periodic maintenance and lubrication
chart.
The throttle cable free play should measure 2.0–
4.0 mm (0.08–0.16 in) at the throttle lever. Period-
ically check the throttle cable free play and, if nec-
essary, adjust it as follows.TIPThe engine idling speed must be checked, and ad-
justed if necessary, before adjusting the throttle ca-ble free play.
1. Slide the rubber cover back.
2. Loosen the locknut.
3. To increase the throttle cable free play, turn
the throttle cable free play adjusting bolt in di-
rection (a). To decrease the throttle cable free
play, turn the adjusting bolt in direction (b).4. Tighten the locknut.
5. Slide the rubber cover to its original position.
EBU24060Valve clearance The valve clearance changes with use, resulting in
improper air-fuel mixture and/or engine noise. To
prevent this from occurring, the valve clearance
must be adjusted by a Yamaha dealer at the inter-
vals specified in the periodic maintenance and lu-
brication chart.1. Rubber cover
2. Throttle cable free play adjusting bolt
3. Locknut
4. Throttle cable free play
4 2 1
3
(a)
(b)
U33B70E0.book Page 20 Wednesday, June 11, 2008 1:38 PM