DAELIM HISTORY 125 - SERVICE, Service Manual

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●
Remove the valve spring, valve cotter, retainer, spring
and valve. Using the valve spring compressor.
TOOL : VALVE SPRING COMPRESSOR
NOTE
·
To prevent the loss of tension, do not compress the
valve spring more than necessary.
·
Mark the disassembled parts so that they can be
reassembled into the original position later.
●
Remove the valve spring seat and valve stem seal.
Remove carbon deposits from the inside of the
combustion chamber.
CYLINDER HEAD INSPECTION
●
Remove gasket marks from the cylinder head gasket.
NOTE
·
Take precautions not to damage the cylinder head
gasket attachment.
●
Check the spark plug assembling hole and the valve
seat for cracks.
●
Using a square and a feeler gauge, check the cylinder
head distortion.
SERVICE LIMIT : 0.1 mm
VALVE SPRINGS
●
Measure the free length of the inner and outer valve
springs.
SERVICE LIMIT : 36.90 mm
NOTE
·
Replace the valve spring with new one if the length
of any one is less than the service limit.
VALVES
●
Inspect each valve for bending, burning, scratches or
abnormal wear.
●
Insert the valves in their original positions in the
cylinder head.
Check that each valve moves up and down smothly,
without binding.
●
Measure and record the valve stem outer diameter in
three places along the valve guide sliding area.
SERVICE LIMIT : IN : 4.920 mm
EX: 4.900 mm
●
Replace the valve with a new one if the service limit is
exceeded.
9-6
CYLINDER HEAD / VALVES
VALVE SPRING
COMPRESSOR