Yamaha YZ450FY 2009 Owner's Service Manual page 37

Item
Guide inside diameter (IN)
Guide inside diameter (EX)
Stem-to-guide clearance (IN)
Stem-to-guide clearance (EX)
Stem runout limit
Valve seat width (IN)
Valve seat width (EX)
Valve spring:
Free length (IN)
Free length (EX)
Set length (valve closed) (IN)
Set length (valve closed) (EX)
Compressed force (installed) (IN)
Compressed force (installed) (EX)
Tilt limit* (IN)
Tilt limit* (EX)
Direction of winding (top view) (IN)
Direction of winding (top view) (EX)
MAINTENANCE SPECIFICATIONS
Standard
4.500–4.512 mm (0.1772–0.1776
in)
5.000–5.012 mm (0.1969–0.1973
in)
0.010–0.037 mm (0.0004–0.0015
in)
0.020–0.047 mm (0.0008–0.0019
in)
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0.9–1.1 mm (0.0354–0.0433 in)
0.9–1.1 mm (0.0354–0.0433 in)
37.03 mm (1.46 in)
37.68 mm (1.48 in)
27.87 mm (1.10 in)
27.38 mm (1.08 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)
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)
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Clockwise
Clockwise
2-6
Limit
4.550 mm
(0.1791 in)
5.050 mm
(0.1988 in)
0.08 mm
(0.003 in)
0.10 mm
(0.004 in)
0.01 mm
(0.0004 in)
1.6 mm
(0.0630 in)
1.6 mm
(0.0630 in)
36.03 mm
(1.42 in)
36.68 mm
(1.44 in)
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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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