Yamaha YZ450F, Owner'S Service Manual

Page: 77 / 650

SPEC
2 - 6
Valve spring:
Free length IN 37.03 mm (1.46 in) 36.03 mm
(1.42 in)
EX 37.68 mm (1.48 in) 36.68 mm
(1.44 in)
Set length (valve closed) IN 27.87 mm (1.10 in) ----
EX 27.38 mm (1.08 in) ----
Compressed force (installed) IN 111.3 ~ 127.9 N at 27.87 mm
(11.3 ~ 13.0 kg at 27.87 mm,
24.91 ~ 28.66 lb at 1.10 in) ----
EX 127.4 ~ 146.4 N at 27.38 mm
(13.0 ~ 14.9 kg at 27.38 mm,
28.66 ~ 32.85 lb at 1.08 in) ----
Tilt limit IN ---- 2.5°/1.61 mm
(2.5°/0.063 in)
EX ---- 2.5°/1.65 mm
(2.5°/0.065 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