CHAPTER 3C ENGINE 100/125/150/200 SERVICE MANUAL09.0
CHAPTER 3C ENGINE PAGE.3C - 9 -
5. Remove dowel pin, cylinder head gasket
and take out chain guide.
6. Remove the gasket on cylinder surface.
NOTE:
Make sure the contact cylinder surfaces are not
scratched.
Make no other objects fall into the crankcase.
NOTE:
The cylinder head gasket must not be reused.
7. Take out valve seat, lock plate, spring, oil
seal and valve by using a compressor.
8. Clean off carbon deposits in the combustion
chamber.
9. Check spark plug, valve guide and their
surrounding areas for cracks.
10. Check contact face evenness.
Limit: 0.05mm.
11. Measure valve spring free length.
Limit: inner spring ：31.2mm
outer spring ：34.1mm.
12. Check valve stem bend and check for
burnout. Clean carbon deposits off its
surface.
13. Measure valve stem diameter.
Limit: 4.9mm.
14. Clean off carbon deposits in valve guide.
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