Valve Guide Replacement - KYMCO MOVIE 125 Manual

7. CYLINDER HEAD/VALVES
Ream the guides to remove any carbon build-
up using a valve guide reamer.
Special
Valve Guide Reamer
＊
During this operation, rotate the reamer
clockwise and do not insert or remove it
straight when it is stopped.
Measure each valve guide I.D.
Service Limits: IN : 5.03mm replace if over
EX: 5.03mm replace if over
Subtract each valve stem O.D. from the
corresponding guide I.D. to obtain the stem-
to-guide clearance.
Service Limits: IN : 0.08mm replace if over
EX: 0.10mm replace if over
＊
If the stem-to-guide clearance exceeds the
service limits, replace the guides as
necessary. Reface the valve seats
whenever the valve guides are replaced.

VALVE GUIDE REPLACEMENT

Heat the cylinder head to 100_
for this operation.
＊
The cylinder head must be heated evenly
and rapidly to avoid warpage.
＊
Wear heavy gloves when handling the
heated cylinder head to avoid burns.
Drive out the old valve guides.
＊
Be careful not to damage the cylinder
head mating surface.
Special
Valve Guide Driver
Apply engine oil to a new O-ring and drive a
new valve guide from the camshaft side.
The cylinder head should still be hot for
installation of a new guide.
＊
Be careful not to damage the
•
cylinder head mating surface.
After drive in the new guide,
•
check it for damage.
Special
Valve Guide Driver
7-9
150℃
Valve Guide Reamer
Valve Guide Driver
Valve Guide Driver