Yamaha 2001 YZ426F/LC Owner's Service Manual page 282

1
CAMSHAFTS
4. Measure:
Camshaft-to-cap clearance
Out of specification → Measure bearing
diameter (camshaft)
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
head.
Position a strip of Plastigauge
camshaft.
Install the circlip, dowel pins and camshaft
caps.
Bolt (camshaft cap):
10 Nm (1.0 m • kg, 7.2 ft • lb)
NOTE:
Tighten the bolts (camshaft cap) in a
.
crisscross pattern from innermost to outer
caps.
Do not turn the camshaft when measuring
clearance with the Plastigauge
Remove the camshaft caps and measure
the width of the Plastigauge
5. Measure:
Bearing diameter (camshaft) a
Out of specification → Replace the
camshaft.
Within specification → Replace cam-
shaft case and camshaft caps as a set.
Bearing diameter (camshaft):
21.967 ~ 21.980 mm
(0.8648 ~ 0.8654 in)
Camshaft sprocket
1. Inspect:
Camshaft sprocket 1
Wear/damage → Replace the camshaft
assembly and timing chain as a set.
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