Yamaha XVS650 Service Manual page 120

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3.Measure:
• Cylinder head warpage
Out of specification
-7
Resu rface.
ENG
Cylinder head warpage:
less than 0.03 mm (0.001 in)
Warpage measurement and resurfacement
steps:
.Place a straightedge G) and a feeler gauge
®
across the cylinder head.
• Use a feeler gauge to measure the
warpage.
• If the warpage is out of specification,
resurface 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 cylin-
der head several times.
CYLINDER HEADS
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4.1nspect:
• Camshaft sprockets
Wear/damage
-7
Replace the camshaft
sprockets and the timing chain as a set.
®
1/4 tooth
<£) Correct
G)
Roller
®
Sprocket
343-014
5.Check:
• One-way cam operation (tensioner)
Unsmooth operation
-7
Replace.
4 13