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7. CYLINDER HEAD/VALVES ATV 150/125
CYLINDER HEAD
Valve Spring Compressor
DISASSEMBLY
Remove the valve spring cotters, retainers,
springs, spring seats and valve stem seals
using a valve spring compressor.
· Be sure to compress the valve springs
with a valve spring compressor.
· Mark all disassembled parts to ensure
correct reassembly.
Special tool: Valve Spring Compressor
Valve Spring Compressor E040
Remove carbon deposits from the
combustion chamber.
Clean off any gasket material from the
cylinder head mating surface.
Be careful not to damage the cylinder
head mating surface.
INSPECTION
CYLINDER HEAD
Check the spark plug hole and valve areas
for cracks.
Check the cylinder head for warpage with a
straight edge and feeler gauge.
Service Limit: 0.05 mm (0.002 in)
VALVE /VALVE GUIDE
Inspect each valve for bending, burning,
scratches or abnormal stem wear.
Check valve movement in the guide.
Measure each valve stem O.D.
7-8