Cylinder Head Inspection - Sym Fiddle III 50 Service Manual

6. CYLINDER HEAD/VALVE
VALVE ROCKER ARM/ SHAFT
INSPECTION
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.
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 INSPECTION

Check if spark plug and valve holes are crack.
Measure cylinder head flat with a
straightedge and flat feeler gauge.
Service limit: below 0.05mm
Valve spring free length
Measure the free length of intake and
exhaust valve springs.
Standard:
35.250 mm
6-8
The narrow pitch of the spring shall face to the
combustion chamber.
SYM