Sym ALA125CC Manual page 140

6. CYLINDER HEAD/VALVE SYM
Measure the valve rocker arm I.D.
Service Limit: Replace when it is above
10.100 mm
Measure the active O.D. of the valve rocker
arm shaft and valve rocker arm.
Service Limit: Replace when it is above
9.910 mm
Calculate the clearance between the rocker
arm shaft and the rocker arm.
Service Limit: Replace when it is above
0.10 mm
CYLINDER HEAD REMOVAL
Remove double seat, luggage box and front
center cover.
Remove the engine (refer to Chapter 5).
Remove the cooling fan cover.
Remove the engine shroud (4 bolts).
Blow-by hose
Remove the camshaft (refer to page 6-4).
A.I
4 bolts
6-6