Adjusting The Rear Shock Absorber Rebound Damping Force; Adjusting The Rear Shock Absorber Low Compression Damping Force - Yamaha WR450F(Y) 2009 Owner's Service Manual

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4. Adjust:
• Spring preload
Adjustment steps:
a. Loosen the locknut "1".
b. Loosen the adjuster "2" until there
is some clearance between the
spring and adjuster.
c. Measure the spring free length
"a".
d. Turn the adjuster "2".
Stiffer → Increase the spring pre-
load. (Turn the adjuster "2" in.)
Softer → Decrease the spring pre-
load. (Turn the adjuster "2"
out.)
Extent of adjustment:
Maximum
Minimum
Position in
Position in
which the
which the
spring is turned
spring is turned
in 13 mm (0.51
in 1.5 mm (0.06
in) from its free
in) from its free
length.
length.
• 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.
e. Tighten the locknut.
Locknut:
30 Nm (3.0 m•kg, 22
ft•lb)
5. Install:
• Rear frame (upper)
Rear frame (upper):
38 Nm (3.8 m•kg, 27
ft•lb)
• Rear frame (lower)
Rear frame (lower):
32 Nm (3.2 m•kg, 23
ft•lb)
ADJUSTING THE REAR SHOCK
ABSORBER REBOUND DAMPING
FORCE
1. Adjust:
• Rebound damping force
By turning the adjuster "1".
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
20 clicks out
Fully turned in
(from maximum
position
position)
• STANDARD POSITION:
This is the position which is back
by the specific number of clicks
from the fully turned-in position.
(Which align the punch mark "a"
on the adjuster with the punch
mark "b" on the bracket.)
Standard position:
About 11 clicks out
Do not force the adjuster past the
minimum or maximum extent of
adjustment. The adjuster may be
damaged.
3-25
CHASSIS
ADJUSTING THE REAR SHOCK
ABSORBER LOW COMPRESSION
DAMPING FORCE
1. Adjust:
• Low compression damping force
By turning the adjuster "1".
Stiffer "a" → Increase the low
compression damping force.
(Turn the adjuster "1" in.)
Softer "b" → Decrease the low
compression damping force.
(Turn the adjuster "1" out.)
Extent of adjustment:
Maximum
Minimum
20 clicks out
Fully turned in
(from maximum
position
position)
• STANDARD POSITION:
This is the position which is back
by the specific number of clicks
from the fully turned-in position.
(Which align the punch mark "a"
on the adjuster with the punch
mark "b" on the high compression
damping adjuster.)
Standard position:
About 8 clicks out
* About 9 clicks out
** About 11 clicks out
* For AUS, NZ and ZA
** For EUROPE
Do not force the adjuster past the
minimum or maximum extent of
adjustment. The adjuster may be
damaged.

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