Yamaha YFZ450S 2003 Service Manual page 156

CAMSHAFTS
4. Measure:
• camshaft-journal-to-camshaft-cap clearance
Out of specification → Measure the cam-
shaft journal diameter.
Camshaft-journal-to-camshaft-cap
clearance
0.020 ~ 0.054 mm
(0.0008 ~ 0.0021 in)
<Limit>: 0.080 mm (0.0032 in)
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a. Install the camshaft into the cylinder head
(without the camshaft caps).
b. Position a strip of Plastigauge
camshaft journal as shown.
c. Install the circlip and camshaft caps.
NOTE:
• Tighten the camshaft cap bolts in stages and
in a crisscross pattern, working from the
inner caps out.
• Do not turn the camshaft when measuring
the camshaft-journal-to-camshaft-cap clear-
ance with the Plastigauge
Camshaft cap bolt
10 Nm (1.0 m · kg, 7.2 ft · lb)
d. Remove the camshaft caps and then mea-
sure the width of the Plastigauge
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5. Measure:
• camshaft journal diameter a
Out of specification → Replace the cam-
shaft.
Within specification → Replace the cylinder
head and camshaft caps as a set.
Camshaft journal diameter
21.967 ~ 21.980 mm
(0.8648 ~ 0.8654 in)
4 - 13
ENG
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L L LLL L L LLL L
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1 onto the
1.
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