CHAPTER 3A ENGINE 260/ 300 / 400 cc ATV SERVICE MANUAL09.0
CHAPTER 3 ENGINE PAGE. 3A- 30
VALVES AND VALVE SPRINGS REMOVAL
1. Remove:
z Valve cotters c
NOTE:
Attach a valve spring compressor and attachment
d between the valve spring retainer and cylinder
head to remove the valve cotters.
CAUTION:
Do not compress so much as to avoid damage to
the valve spring.
VALVE AND VALVE SPRINGS INSPECTION
1. Measure:
zValve stem diameter
Out of specification → Replace.
Valve stem diameter:
Intake:
5.975-5.990mm
<Limit: 5.94mm>
Exhaust:
5.960-5.975mm
<Limit: 5.92mm>
2. Measure:
zRunout (valve stem )
Out of specification → Replace.
zRunout limit:
0.01 mm
3. Measure:
zFree length (valve spring)
Out of specification → Replace.
Valve spring free length:
Inner spring:
38.1 mm
<Limit: 36.1mm>
Outer spring:
36.93 mm
<Limit: 35.0mm>
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