Yamaha 2003 YZ450FR Owner's Service Manual page 42

Item
Valve spring:
Free length
Set length (valve closed)
Compressed force
(installed)
Tilt limit
*
Direction of winding
(top view)
Piston:
Piston to cylinder clearance
Piston size "D"
D
Measuring point "H"
Piston off-set
Piston pin bore inside diameter
Piston pin outside diameter
MAINTENANCE SPECIFICATIONS
IN 37.03 mm (1.46 in)
EX 37.68 mm (1.48 in)
IN 27.87 mm (1.10 in)
EX 27.38 mm (1.08 in)
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)
IN ----
EX ----
IN Clockwise
EX Clockwise
0.040 ~ 0.065 mm
(0.0016 ~ 0.0026 in)
94.945 ~ 94.960 mm
(3.738 ~ 3.739 in)
H
8 mm (0.315 in)
1 mm (0.0394 in)
18.004 ~ 18.015 mm
(0.7088 ~ 0.7093 in)
17.991 ~ 18.000 mm
(0.7083 ~ 0.7087 in)
2 - 6
SPEC
Standard Limit
35.17 mm
(1.38 in)
35.79 mm
(1.41 in)
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----
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2.5˚/ 1.61 mm
(2.5˚/0.063 in)
2.5˚/1.65 mm
(2.5˚/0.065 in)
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----
0.1 mm
(0.004 in)
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----
----
18.045 mm
(0.7104 in)
17.971 mm
(0.7075 in)