Yamaha YZ250F(X) Owner's Service Manual page 63

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".
→
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 Extent of ad-
length justment
One I.D. mark
268 mm 255.5–273.5
(10.55 in) mm (10.06–
*262 mm 10.77 in)
(10.31 in)
Two I.D. marks
274 mm 261.5–279.5
(10.79 in) mm (10.30–
*268 mm 11.00 in)
(10.55 in)
Three I.D.
marks 253.0–271.0
265.5 mm mm (9.96–10.67
(10.45 in) in)
*259.5 mm
(10.22 in)
* For EUROPE
• 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.
• The I.D. mark "b" is marked at the
end of the spring.
• The standard length and extent of
adjustment vary according to the
quantity of I.D. marks.
Never attempt to turn the adjuster
beyond the maximum or minimum
setting.
5. Tighten:
• Locknut
6. 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.)
3-19
CHASSIS
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 8 clicks out
Do not force the adjuster past the
minimum or maximum extent of
adjustment. The adjuster may be
damaged.
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)