Yamaha 1999 XVS1100, Service Manual

Page: 128 / 355

4-23
VALVE AND VALVE SPRINGS
ENG
NOTE:
NOTE:
Out of specification Replace the valve
guide.
Valve-stem-to-valve-guide
clearance
Intake 0.010
0.037 mm
<Limit>: 0.08 mm
Exhaust 0.025 0.052 mm
<Limit>: 0.10 mm
2. Replace.
S
valve guide
To ease valve guide removal and installation,
and to maintain the correct fit, heat the cylinder
head to 100
_
C (212
_
K) in an oven.
a. Remove the valve guide with a valve guide
remover 1 .
b. Install the new valve guide with a valve guide
installer 2 and valve guide remover 1 .
c. After installing the valve guide, bore the
valve guide with a valve guide reamer 3 to
obtain the proper valve-stem-to-valve-guide
clearance.
After replacing the valve guide, reface the valve
seat.
Valve guide remover and installer
(8 mm)
90890-04014
3. Eliminate:
S
carbon deposits
(from the valve face and valve seat)
4. Check:
S
valve face
Pitting/ wear
Grind the valve face.
S
valve stem end
Mushroom shape or diameter larger than the
body of the valve stem
Replace the valve.