Yamaha YZ250F(W) Owner's Service Manual page 312

CAMSHAFTS
4. Measure:
• Camshaft-to-cap clearance
Out of specification → Measure camshaft
outside diameter.
Camshaft-to-cap clearance:
0.028 ~ 0.062 mm
(0.0011 ~ 0.0024 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 clip, 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 criss-
cross 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:
• Camshaft outside diameter a
Out of specification → Replace the cam-
shaft.
Within specification → Replace camshaft
case and camshaft caps as a set.
Camshaft outside diameter:
21.959 ~ 21.972 mm
(0.8645 ~ 0.8650 in)
Camshaft sprocket
1. Inspect:
• Camshaft sprocket 1
Wear/damage → Replace the camshaft
assembly and timing chain as a set.
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ENG
1 onto the
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