Sym PA12B User Manual

To this chapter contents
7. Cylinder Head / Valve
7-8
Special tool：
Valve spring compressor SYM-1471100
Caution
z Do not over compress the valve spring.
z When removing the carbon deposit,
beware not to damage the components
inside the combustion chamber.
Valve cotter removal / assembly tool is
recommended when removing the valve
spring
Special tool：
Valve cotter removal / assembly tool
SYM-1471110/20
Caution
z To avoid damaging the valve stem and
the cylinder head, in the combustion
chamber place a rag between the valve
spring remover/installer as compressing
the valve spring directly.
Valve spring compressor
Cylinder Head Inspection
Clean the gasket residue on the matching
surface.
Check if the cylinder head has any cracks.
Measure cylinder head warp with a
straightedge and thickness gauge.
Service Limit：0.05mm
Valve Spring Free Length
Measure the free length of intake and exhaust
valve spring.
Service Limit：
Outer spring: Under 39.7mm
Inner Spring: Under 32.5mm
Valve cotter removal /
assembly tool

Sym PA12B Specifications

General

Brand	Sym
Model	PA12B
Category	Motorcycle
Language	English