Sym HD 125 Service Manual page 72

Remove the 2 cylinder head mounting bolts from
cylinder head right side, and then remove 4 nuts
and washers from cylinder head upper side.
Remove the cylinder head.
Remove 2 bolts of carburetor insulator and then
take the insulator out.
Remove cylinder head gasket and 2 dowel pins.
Remove chain guide.
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.
To this chapter contents
Chain guide
6. CYLINDER HEAD/VALVE
2 Insulator bolts
4 Nuts
Cylinder head mounting
Carburetor insulator
Dowel pin
Gasket
6-5