Yamaha Scorpio, Service Manual

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4 - 24
ENG
VALVES AND VALVE SPRINGS
YP******
VALVES AND VALVE SPRINGS
INSPECTION
1.Measure:
●
Valve stem diameter
a
Out of specification
→
Replace
.
YP402010
2.Measure:
●
Runout (valve stem)
Out of specification
→
Replace.
YP402030
3.Measure:
●
Free length (valve spring)
a
Out of specification
→
Replace.
4.Measure:
●
Compressed valve spring force
a
Out of specification
→
Replace
.
b
Installed length
YP402030
5.Measure:
●
Valve spring tilt
a
Out of specification
→
Replace.
Valve stem diameter:
Intake:
5.975 ~ 5.990 mm
<Limit: 5.95 mm>
Exhaust:
5.960 ~ 5.975 mm
<Limit: 5.935 mm>
Runout limit
0.03 mm
Valve spring free length:
Inner valve spring:
36.17 mm
<Limit: 34.47 mm>
Outer valve spring:
36.63 mm
<Limit: 34.63 mm>
Inner valve spring
30.5 mm at 7.65 ~ 9.35 kg
Outer valve spring
32 mm at 13.1 ~ 16.1 kg
Spring tilt limit:
2.5°/16 mm