Yamaha 2004 WR250FS Owner's Service Manual page 340

T U N
SETTING
CAUTION:
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
greater than standard.
Length a of standard shock:
490.5 mm (19.31 in)
È Coverage of spring by weight
É Rider weight
1 Soft
2 Standard
3 Stiff
7 - 19