Checking The Valve Seats - Yamaha XVS1100(L) Service Manual

VALVE AND VALVE SPRINGS
5. Measure:
S valve margin thickness a
Out of specification ! Replace the valve.
6. Measure:
S valve stem runout
Out of specification ! Replace the valve.
NOTE:
S When installing a new valve, always replace
the valve guide.
S If the valve is removed or replaced, always re-
place the valve stem seal.
EAS00240

CHECKING THE VALVE SEATS

The following procedure applies to all of the
valves and valve seats.
1. Eliminate:
S carbon deposits
(from the valve face and valve seat)
2. Check:
S valve seat
Pitting/wear ! Replace the cylinder head.
3. Measure:
S valve seat width a
Out of specification ! Replace the cylinder
head.
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 pattern.
d. Measure the valve seat width. Where the
valve seat and valve face contacted one
another, the blueing will have been removed.
4-24
ENG
Valve margin thickness limit
0.8 mm
Valve stem runout
0.03 mm
Valve seat width limit
Intake: 1.8 mm
Exhaust: 1.8 mm