Yamaha YZ250F(N)/LC Owner's Service Manual page 300

1
CAMSHAFTS
4. Measure:
Camshaft-to-cap clearance
Out of specification
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 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
camshaft.
Within specification
shaft case and camshaft caps as a set.
Camshaft outside diameter:
21.967 ~ 21.980 mm
(0.8648 ~ 0.8654 in)
Camshaft sprocket
1. Inspect:
Camshaft sprocket 1
Wear/damage
assembly and timing chain as a set.
4 - 23
ENG
Measure bearing
®
1 onto the
®
.
®
1.
Replace the
Replace cam-
Replace the camshaft