KYMCO 125 MOVIE S INJECTION, Manual

Page: 83 / 213

7. CYLINDER HEAD/VALVES
7-9
Ream the guides to remove any carbon build-
up using a valve guide reamer.
Valve Guide Reamer
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
VALVE GUIDE REPLACEMENT
Heat the cylinder head to 100
_
150
℃
for this operation.
Drive out the old valve guides.
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.
Valve Guide Driver
Valve Guide Driver
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.
＊
The cylinder head must be heated evenly
and rapidly to avoid warpage.
＊
Valve Guide Reamer
Be careful not to damage the cylinder
head mating surface.
＊
•
Be careful not to damage the
cylinder head mating surface.
•
After drive in the new guide,
check it for damage.
＊
Valve Guide Driver
During this operation, rotate the reamer
clockwise and do not insert or remove it
straight when it is stopped.
＊
Special
Wear heavy gloves when handling the
heated cylinder head to avoid burns.
＊
Special
Special