Yamaha YZ450FA 2011 Owner's Service Manual page 42

Item
"D" margin thickness (IN)
"D" margin thickness (EX)
Stem outside diameter (IN)
Stem outside diameter (EX)
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)
MAINTENANCE SPECIFICATIONS
Standard
1.3 mm (0.0512 in)
1.0 mm (0.0394 in)
5.475–5.490 mm (0.2156–0.2161
in)
5.465–5.480 mm (0.2152–0.2157
in)
5.500–5.512 mm (0.2165–0.2170
in)
5.500–5.512 mm (0.2165–0.2170
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)
40.76 mm (1.60 in)
37.01mm (1.46 in)
34.78 mm (1.37 in)
30.83 mm (1.21 in)
178–204 N at 34.78 mm
(18.2–20.8 kg at 34.78 mm,
40.01–45.86 lb at 1.37 in)
124–142 N at 30.83 mm
(12.6–14.5 kg at 30.83 mm,
27.88–31.92 lb at 1.21 in)
2-6
Limit
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5.445 mm
(0.2144 in)
5.435 mm
(0.2140 in)
5.550 mm
(0.2185 in)
5.550 mm
(0.2185 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)
39.76 mm
(1.57 in)
36.01 mm
(1.42 in)
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