Yamaha YZ450F 2020 Owner's Service Manual page 110

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 4-59.
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".
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).
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
1 1
mm (0.06 in) per turn of the adjusting ring.
2 2
e. Tighten the locknut.
3. Install:
• Rear frame
Refer to "REAR SHOCK ABSORBER AS-
SEMBLY" on page 4-59.
Rebound damping
ECA24370
NOTICE
Do not turn the adjuster forcibly beyond its
adjusting range.
3-30
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 4.0 mm (0.16 in) from
its free length. (AUS, CAN, NZL,
ZAF)
Position in which the spring is
turned in 7.0 mm (0.28 in) from
its free length. (AUT, BEL, CHE,
CYP, CZE, DEU, DNK, ESP, FIN,
FRA, GBR, GRC, HRV, HUN, IRL,
ITA, NLD, NOR, POL, PRT, SVK,
SVN, SWE, TUR)
Maximum
Position in which the spring is
turned in 18.0 mm (0.71 in) from
its free length.
b b
Locknut
10 N·m (1.0 kgf·m, 7.4 lb·ft)
CHASSIS
c c