Sym EuroMX 125 Service Manual page 79

6. Cylinder Head/Valve
Remove cylinder head gasket and 2 lock pins.
Remove chain plate.
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.
Remove valve stem guide seal.
Clean carbon deposits in combustion chamber.
Clean residues and foreign materials on cylinder
head matching surface.
Caution
Do not damage the matching surface of
cylinder head.
Cylinder Head
Check if spark plug and valve holes are crack.
Measure cylinder head plane with a straightedge
and flat feeler gauge.
Service limit: 0.5 mm
Valve Spring Free Length
Measure the free length of intake and exhaust
valve springs.
Service limit: 31.5 mm
6-8
This chapter Contents
Lock pin
Chain plate
Cylinder head gasket