Yamaha WR450F(V) Owner's Service Manual page 772

T U N
SETTING
CAUTION:
When using a rear cushion other than cur-
rently installed, use the one whose overall
length a does not exceed the standard as
it may result in faulty performance. Never
use one whose overall length is greater
than standard.
Length a of standard shock:
487.5 mm (19.19 in)
È Coverage of spring by weight
É Rider weight
1 Soft
2 Standard
3 Stiff
7 - 17