KYMCO ZING 150 User Manual

6. CYLINDER HEAD/VALVES
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Inspect the valve seat contact area.
If the contact area is too high on the valve,
the seat must be lowered using a 37.5° cutter.
If the contact area is too low on the valve, the
seat must be raised using a 63.5° cutter.
Refinish the seat to specifications using a 45°
seat cutter.
After cutting the seat, apply emery to each
valve contact face and lap the valve using a
lapper.
After lapping, wash all residuals off the
cylinder head and valves.
After refacing and lapping, apply red lead to
the 45° valve seat to make sure that the
center of the valve contact face is even.
CYLINDER HEAD ASSEMBLY
Lubricate each valve stem with engine oil
and insert the valves into the valve guides.
Apply engine oil to the valve stem seals and
install them into the valve guides.
Install the valve spring seats, washers, inner
and outer springs, and retainers.
Compress the valve springs using the valve
spring compressor, then install the valve
cotters.
Valve Spring Compressor
Valve Spring Compressor Attachment
Be sure to install new valve stem seals.
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Old Seat Width
Old Seat Width
Contact too High
Contact too Low
•
When lapping, use a light pressure and
avoid damaging the valve seat due to
forcedly lapping.
• Use care not to allow emery powder to
enter the valve stem and guide.
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Valve Spring Compressor
•
Use the valve spring compressor to
compress the springs and do not
damage the cylinder head surface.
• Install the cotters with the pointed ends
facing down.
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Special
Stem Seal
Valve Stem
Valve Spring Compressor Attachment

KYMCO ZING 150 Specifications

General

Brand	KYMCO
Model	ZING 150
Category	Motorcycle
Language	English