Yamaha YZ450FN 2022, Owner'S Service Manual, Page: 355 / 366

CHASSIS
10-4
EAM30177
SETTING OF SPRING AFTER
REPLACEMENT
After replacement, be sure to adjust the spring to
the set length [sunken length 90–100 mm (3.5–
3.9 in)] and set it.
1. Use of soft spring
•
Adjust to decrease rebound damping force to
compensate for less spring load. Run with the
rebound damping force adjuster one or two
clicks turned out, and readjust it to suit your
preference.
2. Use of stiff spring
•
Adjust to increase rebound damping force to
compensate for greater spring load. Run with
the rebound damping force adjuster one or
two clicks turned in, and readjust it to suit your
preference.
TIP
Adjusting the rebound damping force will be fol-
lowed more or less by a change in the compres-
sion damping force. For correction, adjust to
decrease compression damping force.
WARNING
EWA19200
When using a rear shock absorber other
than currently installed, use the one whose
overall length “a” does not exceed the stan-
dard as it may result in faulty performance.
Never use one whose overall length is great-
er than standard.
EAM30178
REAR SHOCK ABSORBER SETTING PARTS
• Rear shock spring “1”
B2WC
B2WG
TIP
•
The I.D. mark “a” is marked at the end of the
spring.
•
Spring specification varies according to the
color of I.D. marks.
Length “a” of standard shock
460.5 mm (18.1 in)
a
STD Spring rate
N/mm
58
Type
Spring
rate
N/mm
Part number
I.D.
mark
SOFT 52
BR9-22212-00
(Blue)
Yellow
54
BR9-22212-10
(Blue)
Pink
56
BR9-22212-A0
(Silver)
White
58
BR9-22212-B0
(Silver)
Gold
STIFF 60
BR9-22212-40
(Blue)
Brown
STD Spring rate
N/mm
58
Type
Spring
rate
N/mm
Part number
I.D.
mark
SOFT 52
BR9-22212-00
(Blue)
Yellow
54
BR9-22212-10
(Blue)
Pink
56
BR9-22212-20
(Blue)
White
58
BR9-22212-30
(Blue)
Silver
STIFF 60
BR9-22212-40
(Blue)
Brown
1
a