KYMCO ZING 150 User Manual

6. CYLINDER HEAD/VALVES
6
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7
Apply engine oil to new O-rings and install
them to new valve guides.
Then, drive in new valve guides.
Ream the new valve guides with a valve
guide reamer.
Clean the cylinder head and remove any
metal particles.
Valve Guide Reamer
VALVE SEAT INSPECTION &
REFACING
VALVE SEAT INSPECTION
Remove carbon deposits from the
combustion chamber and valves.
Apply emery to each valve and valve seat
contact face.
Lap each valve using a hand lapper.
Remove the valve and inspect the valve face.
If the valve face is rough, worn unevenly, or
contacts the seat improperly, the valve must
be replaced.
Inspect the valve seat width.
Service Limit: 1.2～1.5mm replace if over
If the seat is too wide or too narrow or has
low spots, the seat must be ground using a
valve seat cutter.
•
Be careful not to damage the cylinder
head mating surface.
• Check for damage after driving in the
new valve guides.
• The new valve guides must have
oversized O.D.
＊
＊＊
＊
Valve Seat Width
Valve Guide Driver
•
Use cutting oil on the reamer during
this operation.
• Rotate the reamer clockwise and do not
insert or remove it straight when it is
stopped.
＊
＊＊
＊
Valve Guide Reamer
Special
Valve Guide
Lapper
Cylinder Head

KYMCO ZING 150 Specifications

General

Brand	KYMCO
Model	ZING 150
Category	Motorcycle
Language	English