Yamaha XV1700PCRC Service Manual page 344

VALVES AND VALVE SPRINGS
3. Measure:
• valve seat width a
Out of specification → Replace the cylinder
head.
M MMM
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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5 - 44
ENG
Valve seat width
Intake
0.9 ~ 1.1 mm
(0.0354 ~ 0.0433 in)
Exhaust
0.9 ~ 1.1 mm
(0.0354 ~ 0.0433 in)
M MMM M M MMM M M MMM M M MMM M
L LLL L L LLL L L LLL L L LLL L
M MMM M MMM
L LLL L LLL