Checking The Valve Seats - Yamaha YZF-R6 Service Manual

VALVES 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 oil 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.
4-25
ENG
Valve margin thickness
0.6 mm X 0.8 mm
<LIMIT>: 0.5mm
Valve stem runout
0.04 mm
Valve seat width
Intake: 0.9 X 1.1 mm
<Limit>: 1.6 mm