Yamaha WR450F(W), Owner'S Service Manual

Page: 95 / 794

SPEC
2 - 6
Valve spring:
Free length IN 39.46 mm (1.55 in) 38.46 mm
(1.51 in)
EX 37.61 mm (1.48 in) 36.61 mm
(1.44 in)
Set length (valve closed) IN 27.87 mm (1.10 in) ----
EX 28.38 mm (1.12 in) ----
Compressed force
(installed)
IN 130.2 ~ 149.8 N at 27.87 mm
(13.28 ~ 15.28 kg at 27.87 mm,
29.27 ~ 33.68 lb at 1.10 in) ----
EX 123.1 ~ 141.7 N at 28.38 mm
(12.55~ 14.45 kg at 28.38 mm,
27.67 ~ 31.85 lb at 1.12 in) ----
Tilt limit IN ---- 2.5°/ 1.7 mm
(2.5°/0.067 in)
EX ---- 2.5°/1.6 mm
(2.5°/0.063 in)
Direction of winding (top view) IN Clockwise ----
EX Clockwise ----
Piston:
Piston to cylinder clearance 0.040 ~ 0.065 mm
(0.0016 ~ 0.0026 in) 0.1 mm
(0.004 in)
Piston size “D” 94.945 ~ 94.960 mm
(3.738 ~ 3.739 in) ----
Measuring point “H” 8 mm (0.315 in) ----
Piston off-set 1 mm (0.0394 in) ----
Piston pin bore inside diameter 18.004 ~ 18.015 mm
(0.7088 ~ 0.7093 in) 18.045 mm
(0.7104 in)
Piston pin outside diameter 17.991 ~ 18.000 mm
(0.7083 ~ 0.7087 in) 17.971 mm
(0.7075 in)
Item Standard Limit
*
H
D
MAINTENANCE SPECIFICATIONS