DAELIM Roadwin 250R FI VJF125, Service Manual

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10-7
CYLINDER HEAD / VALVES
VALVE GUIDES REPLACEMENT
Refinish the valve seats whenever the valve guides
are replaced to prevent uneven seating.
Replace the cylinder head with the temperature of
130
℃
- 140
℃
.
Do not heat the cylinder head beyond 150
℃
.
Unskillful operation can give the burns.
Do not heat the cylinder head partly using the torch
that may cause the cylinder head warping.
Reface and clean the cylinder head.
Inspect and correct around the valve seat.
Support the cylinder head and drive the old guides out
of the combustion chamber side of the cylinder head.
TOOL : VALVE GUIDE DRIVER
Install the new O-ring to new valve guide.
Insert the valve guide from the upper part of cylinder
head.
TOOL : VALVE GUIDE DRIVER
After insert the valve guide, complete the valve guide
reamer by putting the valve guide reamer on the
cylinder head’s conbustion chamber.
TOOL : VALVE GUIDE REAMER
Avoid damaging the head when driving the valve
guide out.
Take care not to tilt or lean the reamer in the guide
while reaming.
Otherwise, the valve is installed slanted, that causes
oil leaks from the stem seal and improper valve seat
contact and results in the valve seat refacing not able
to be performed.
Use cutting oil on the reamer during this operation.