Yamaha WR450F Owner's Service Manual page 60

Rear suspension
Type
Spring/shock absorber type
Rear shock absorber assembly travel
Spring free length
Spring installed length
Spring rate K1
Spring stroke K1
Optional spring available
Enclosed gas/air pressure (STD)
Spring preload adjusting positions
Minimum
Standard
Maximum
Rebound damping adjusting positions
Minimum
Standard
Maximum
Compression damping setting
(for fast compression damping)
Minimum
Standard
Maximum
Compression damping setting
(for slow compression damping)
Minimum
Standard
Maximum
Swingarm
Swingarm end free play limit (radial)
Swingarm end free play limit (axial)
Drive chain
Size/manufacturer
Number of links
Drive chain slack (on a suitable stand)
15-link length limit
CHASSIS SPECIFICATIONS
Swingarm (link suspension)
Coil spring/Gas-hydraulic damper
126.0 mm (4.96 in)
275.0 mm (10.83 in)
263.0 mm (10.35 in)
56.00 N/mm (5.71 kgf/mm, 319.76 lbf/in)
0.0–150.0 mm (0.00–5.91 in)
Yes
980 kPa (9.8 kgf/cm
Position in which the spring is turned in 1.5 mm
(0.06 in) from its free length.
Position in which the spring is turned in 12 mm
(0.47 in) from its free length.
Position in which the spring is turned in 18 mm
(0.71 in) from its free length.
30 clicks out*
14 clicks out*
Fully turned in
* With the adjuster fully turned in
2 turns out*
1-3/4 turns out*
Fully turned in
* With the adjuster fully turned in
20 clicks out*
10 clicks out*
Fully turned in
* With the adjuster fully turned in
1.0 mm (0.04 in)
0.2–0.9 mm (0.01–0.04 in)
DID520VM2/DAIDO
114
50.0–60.0 mm (1.97–2.36 in)
239.3 mm (9.42 in)
2-9
2
, 139.4 psi)