Yamaha YZ450F(X) Owner's Service Manual page 27

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)
Piston:
Piston to cylinder clearance
Piston size "D"
Measuring point "H"
Item
MAINTENANCE SPECIFICATIONS
Standard
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
0.020–0.045 mm (0.0008–0.0018 in)
94.965–94.980 mm (3.7388–3.7394 in)
8 mm (0.315 in)
2-5
Limit
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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0.1 mm (0.004
in)
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