Checking The Valve Seats - Yamaha YZF-R7 Owner's Service Manual

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VALVES AND VALVE SPRINGS
5. Measure:
• valve margin thickness a
Out of specification → Replace the
valve.
Valve margin thickness
Intake
0.9 ~ 1.2 mm
(0.028 ~ 0.047 in)
Exhaust
1.0 ~ 1.3 mm
(0.039 ~ 0.051 in)
6. Measure:
• valve stem runout
Out of specification → Replace the
valve.
NOTE:
• When installing a new valve, always
replace the valve guide.
• If the valve is removed or replaced,
always replace the oil seal.
Valve stem runout
0.01 mm (0.0004 in)
EB403410

CHECKING THE VALVE SEATS

The following procedure applies to all of
the valves and valve seats.
1. Eliminate:
• carbon deposits
(from the valve face and valve seat)
2. Check:
• valve seat
Pitting/wear → Replace the cylinder
head.
3. Measure:
• valve seat width a
Out of specification → Replace the cyl-
inder head.
Valve seat width
0.9 ~ 1.1 mm
(0.035 ~ 0.043 in)
<Limit>: 1.6 mm (0.06 in)
4 - 26
ENG