4 - 26
ENG
VALVES AND VALVE SPRINGS
5. Measure:
• valve margin thickness
a
Out of specification
→
Replace the
valve.
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 margin thickness
Intake
0.9 ~ 1.2 mm
(0.028 ~ 0.047 in)
Exhaust
1.0 ~ 1.3 mm
(0.039 ~ 0.051 in)
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)
Summary of Contents for YZF-R7
Page 1: ...5FL 28199 E0 YZF R7 OWNER S SERVICE MANUAL ...
Page 8: ......
Page 58: ...2 20 SPEC Crankcase tightening sequence TIGHTENING TORQUES ...
Page 72: ...3 3 CHK ADJ ...
Page 363: ...8 27 ELEC ...
Page 380: ......