Yamaha YZ450F(S) Owner's Service Manual page 288

CAMSHAFTS
4. Measure:
Camshaft-to-cap clearance
G
Out of specification → Measure cam-
shaft journal diameter.
Camshaft-to-cap clearance:
0.020 ~ 0.054 mm
(0.0008 ~ 0.0021 in)
<Limit>: 0.08 mm (0.003 in)
Measurement steps:
Install the camshaft onto the cylinder
G
head.
Position a strip of Plastigauge
G
camshaft.
Install the circlip, dowel pins and camshaft
G
caps.
Bolt (camshaft cap):
10 Nm (1.0 m • kg, 7.2 ft • lb)
NOTE:
Tighten the bolts (camshaft cap) in a criss-
G
cross pattern from innermost to outer
caps.
Do not turn the camshaft when measuring
G
clearance with the Plastigauge
Remove the camshaft caps and measure
G
the width of the Plastigauge
5. Measure:
Camshaft journal diameter a
G
Out of specification → Replace the
camshaft.
Within specification → Replace cam-
shaft case and camshaft caps as a set.
Camshaft journal diameter:
21.967 ~ 21.980 mm
(0.8648 ~ 0.8654 in)
Camshaft sprocket
1. Inspect:
Camshaft sprocket 1
G
Wear/damage → Replace the camshaft
assembly and timing chain as a set.
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ENG
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1 onto the
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