Sym Mio 50 Service Manual page 74

Turn the flywheel in counter clockwise motion with
T type wrench until the "Timing" mark on camshaft
aligned with the mark on the cylinder head.
Remove camshaft sprocket mounting bolt and
remove the sprocket.
Remove the left side cylinder head and cylinder
connection bolts (2 bolts)
Remove the cylinder head mounting nuts (4 nuts).
Remove the cylinder head.
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
4 nuts
6. Cylinder Head / Valve
1 bolt
Timing mark
2 bolts
6-5