Sym GTS 250 Service Manual page 76

Remove the side cover mounting blots of cylinder
head, and then take out the side cover.
Remove left crankcase cover, and turn the
Turn the drive face, and align the timing mark on
the sprocket with that of cylinder head, piston is at
TDC position.
Remove cam sprocket bolts and then remove the
sprocket by prying chain out.
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 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
3 bolts
Bolt ×2
6. Cylinder Head / Valve
Timing mark
2 bolts
2 dowel pins
Cam chain guide
4 nuts
6-5