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7. CYLINDER HEAD/VALVES PEOPLE 125/150
Remove carbon deposits from the combustion
chamber.
Clean off any gasket remnants from the
cylinder head contact surface.
Be careful not to damage the cylinder
head mating surface.
INSPECTION
CYLINDER HEAD
Check the spark plug hole and valve hole
areas for cracks.
Check the cylinder head for warpage with a
straight edge and feeler gauge.
Service Limit: 0.05mm repair or replace if
over
VALVE SPRING FREE LENGTH
Measure the free length of the inner and outer
valve springs.
Service Limits:
Inner : 31.2mm replace if below
Outer : 34.1mm replace if below
VALVE /VALVE GUIDE
Inspect each valve for bending, burning, or
abnormal stem wear.
Check valve movement in the guide.
Measure each valve stem O.D.
Service Limits: IN : 4.90mm replace if below
EX: 4.90mm replace if below
7-9