Sym ALA125CC Manual page 141

SYM
Remove the 2 cylinder head mounting bolts
from cylinder head left side cover.
Remove cylinder head gasket and 2 dowel
pins.
Remove chain plate.
Clean up residues from the matching
surfaces of cylinder and cylinder head.
Caution
Do not damage the matching surfaces of
cylinder and cylinder head.
Avoid residues of gasket or foreign
materials falling into crankcase as
cleaning.
CYLINDER HEAD DISASSEMBLY
Use a valve compressor to press the valve
spring.
After removed valve cotters, release the
compressor and then take out spring retainer,
valve spring and valves.
Caution
In order to avoid to loosing spring
tension, do not compress the spring too
much. Its length is based on the
installation of latch.
Special Service Tool: Valve spring compressor.
Remove valve stem guide seal.
Clean carbon deposits in combustion chamber.
Clean residues and foreign materials on
cylinder head matching surface.
Caution
Do not damage the matching surface of
cylinder head.
6. CYLINDER HEAD/VALVE
dowel pins
Chain plate
valve cotters
Cylinder head gasket
6-7