Yamaha XVS6501997 Service Manual page 127

VALVES AND VALVE SPRINGS
2. Replace:
S Valve guide
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Replacement steps:
NOTE:
To ease guide removal, installation and to main-
tain correct fit heat the cylinder head in an oven
to 100_C.
D Remove the valve guide using a valve guide
remover 1 .
D Install the new valve guide using a valve
guide remover 1 and valve guide installer
2 .
D After installing the valve guide, bore the valve
guide using a valve guide reamer 3 to obtain
proper stem-to-guide clearance.
NOTE:
After replacing the valve guide reface the valve
seat.
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3. Inspect:
S Valve face
S Valve stem end
4. Measure:
S Margin thickness a
4-23
Valve guide remover & installer
(7.0 mm):
90890-04018
Pitting/wear ! Grind the face.
Mushroom shape or diameter larger than
the body of the stem ! Replace.
Out of specification ! Replace.
Margin thickness:
Intake:
1.0 X 1.4 mm
<Limit>: 0.8 mm
Exhaust:
1.0 X 1.4 mm
<Limit>: 0.8 mm
ENG