Adjusting The Rear Shock Absorber Assembly - Yamaha YZ125X 2021 Owner's Service Manual

3. Check:
• Rear shock absorber assembly smooth ac-
tion
• Rear suspension link smooth action
Sit astride the seat and shake your body up
and down several times to check whether the
rear shock absorber assembly operates
smoothly.
Unsmooth operation  Correct or replace.
Refer to "REAR SHOCK ABSORBER AS-
SEMBLY" on page 4-54.
EAM30242
ADJUSTING THE REAR SHOCK ABSORBER
ASSEMBLY
Use a maintenance stand to raise the rear wheel
off the ground.
EWA13120
WARNING
Securely support the vehicle so that there is
no danger of it falling over.
Spring preload
ECA24360
NOTICE
Do not turn the adjuster forcibly beyond its
adjusting range.
1. Remove:
• Rear frame
Refer to "REAR SHOCK ABSORBER AS-
SEMBLY" on page 4-54.
2. Adjust:
• Spring preload
a. Loosen the locknut "1".
b. Loosen the adjuster "2" until there is some
clearance between the spring and the ad-
juster.
c. Measure the spring free length "a".
d. Turn the adjuster in the direction of "b" or
"c" to make an adjustment.
Direction "b"
Spring preload is increased (suspen-
sion is harder).
Direction "c"
Spring preload is decreased (suspen-
sion is softer).
Spring preload adjusting positions
Minimum
Position in which the spring is
turned in 1.5 mm (0.06 in) from
its free length.
Standard
Position in which the spring is
turned in 6.0 mm (0.24 in) from
its free length.
Maximum
Position in which the spring is
turned in 18.0 mm (0.71 in) from
its free length.
TIP
• Be sure to remove all dirt and mud from around
the locknut and adjusting ring before adjust-
ment.
• The length of the spring (installed) changes 1.5
mm (0.06 in) per turn of the adjusting ring.
e. Tighten the locknut.
3. Install:
• Rear frame
Refer to "REAR SHOCK ABSORBER AS-
SEMBLY" on page 4-54.
Rebound damping
ECA24370
NOTICE
Do not turn the adjuster forcibly beyond its
adjusting range.
1. Adjust:
• Rebound damping
a. Turn the adjuster "1" in the direction of "a"
or "b" to make an adjustment.
3-21
CHASSIS
b b
c c