Yamaha WR450FX, Owner'S Service Manual

Page: 75 / 220

3-22
CHASSIS
1. Elevate the front wheel by placing
a suitable stand under the engine.
2. Remove the air bleed screw "1"
and release the internal pressure
from the front fork.
3. Install:
• Air bleed screw
ADJUSTING THE FRONT FORK
REBOUND DAMPING FORCE
1. Adjust:
•
Rebound damping force
By turning the adjuster "1".
•
STANDARD POSITION:
This is the position which is back
by the specific number of clicks
from the fully turned-in position.
Do not force the adjuster past the
minimum or maximum extent of
adjustment. The adjuster may be
damaged.
Always adjust each front fork to
the same setting. Uneven adjust-
ment can cause poor handling and
loss of stability.
ADJUSTING THE FRONT FORK
COMPRESSION DAMPING FORCE
1. Remove:
•
Rubber cap
2. Adjust:
•
Compression damping force
By turning the adjuster "1".
•
STANDARD POSITION:
This is the position which is back
by the specific number of clicks
from the fully turned-in position.
Do not force the adjuster past the
minimum or maximum extent of
adjustment. The adjuster may be
damaged.
Always adjust each front fork to
the same setting. Uneven adjust-
ment can cause poor handling and
loss of stability.
3. Install:
•
Rubber cap
CHECKING THE REAR SHOCK
ABSORBER
1. Inspect:
•
Swingarm smooth action
Abnormal noise/unsmooth action
→
Grease the pivoting points or
repair the pivoting points.
Damage/oil leakage
→
Replace.
ADJUSTING THE REAR SHOCK
ABSORBER SPRING PRELOAD
1. Elevate the rear wheel by placing
the suitable stand under the en-
gine.
2. Remove:
• Rear frame
3. Loosen:
• Locknut "1"
4. Adjust:
• Spring preload
By turning the adjuster "2".
• Be sure to remove all dirt and mud
from around the locknut and adjust-
er before adjustment.
•
The length of the spring (installed)
changes 1.5 mm (0.06 in) per turn
of the adjuster.
Never attempt to turn the adjuster
beyond the maximum or minimum
setting.
Air bleed screw:
1 Nm (0.1 m•kg, 0.7
ft•lb)
Stiffer "a"
→
Increase the re-
bound damping force. (Turn
the adjuster "1" in.)
Softer "b"
→
Decrease the re-
bound damping force. (Turn
the adjuster "1" out.)
Extent of adjustment:
Maximum Minimum
Fully turned in
position
20 clicks out
(from maximum
position)
Standard position:
8 clicks out
Stiffer "a"
→
Increase the com-
pression damping force. (Turn
the adjuster "1" in.)
Softer "b"
→
Decrease the com-
pression damping force. (Turn
the adjuster "1" out.)
Extent of adjustment:
Maximum Minimum
Fully turned in
position
20 clicks out
(from maximum
position)
Standard position:
9 clicks out
Stiffer
→
Increase the spring pre-
load. (Turn the adjuster "2" in.)
Softer
→
Decrease the spring pre-
load. (Turn the adjuster "2"
out.)
Spring length (installed)
"a":
Standard
length
Extent of ad-
justment
252.5 mm (9.94
in) 238.5–258.5
mm (9.39–10.18
in)
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