Yamaha FJR1300R Service Manual page 337

VALVES AND VALVE SPRINGS
3. Measure:
• valve seat width a
Out of specification → Replace the cylinder
head.
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a. Apply Mechanic's blueing dye (Dykem) b
onto the valve face.
b. Install the valve into the cylinder head.
c. Press the valve through the valve guide and
onto the valve seat to make a clear impres-
sion.
d. Measure the valve seat width.
NOTE:
@
Where the valve seat and valve face contacted
one another, the blueing will have been
removed.
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4. Lap:
• valve face
• valve seat
NOTE:
@
After replacing the cylinder head or replacing
the valve and valve guide, the valve seat and
valve face should be lapped.
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a. Apply a coarse lapping compound a to the
valve face.
CAUTION:
@
Do not let the lapping compound enter the
gap between the valve stem and the valve
guide.
b. Apply molybdenum disulfide oil onto the
valve stem.
5 - 28
ENG
Valve seat width
Intake: 0.9 ~ 1.1 mm
(0.0354 ~ 0.0433 in)
<Limit>: 1.6 mm (0.0630 in)
Exhaust: 0.9 ~ 1.1 mm
(0.0354 ~ 0.0433 in)
<Limit>: 1.6 mm (0.0630 in)
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