KYMCO 125 MOVIE S INJECTION, Manual

Page: 84 / 213

7
. CYLINDER HEAD/VALVES
7-10
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 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 : 1.8mm replace if over
If the seat is too wide or too narrow, the seat
must be ground using a valve seat cutter.
VALVE SEAT CUTTERS
Refer to the Instructions supplied with the
Valve Seat Refacing Equipment for details.
When refacing the seat, apply a force of
4
_
5kg to press the valve seat cutter for
grinding operation.
Valve Seat Cutters
Valve Seat Width
Apply engine oil to the cutter and reuse
it after all grinding residuals are removed.
＊
•
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