Installing The Camshaft And Cylinder Head - Yamaha YFM660RN Service Manual

CAMSHAFT AND CYLINDER HEAD
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3.Measure:
Cylinder head warpage
Out of specification → Resurface.
Cylinder head warpage:
Less than 0.05 mm (0.002 in)
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Warpage measurement and resurfacing
steps:
Place a straightedge and a feeler gauge
across the cylinder head.
Use a feeler gauge to measure the warpage.
If the warpage is out of specification, resur-
face the cylinder head.
Place a 400 ~ 600 grit wet sandpaper on the
surface plate, and resurface the head using
a figure-eight sanding pattern.
NOTE:
To ensure an even surface rotate the cylinder
head several times.
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INSTALLING THE CAMSHAFT AND CYLIN-
DER HEAD
1.Install:
Cylinder head
Bolts (M9 : 1 ~ 6)
38 Nm (3.8 m · kg, 27 ft · lb)
Bolt (M6 : 7)
10 Nm (1.0 m · kg, 7.2 ft · lb)
NOTE:
Tighten the bolts in the proper sequence.
Follow the numerical order shown in the illus-
tration. Tighten the bolts in two stages.
ENG