Cylinder Head Disassembly - Sym ATTILA RS-21 EFi 150 Service Manual

6. Cylinder Head/Valve

Cylinder Head Disassembly

Remove the adjustment hole cap for the EX & IN
valve clearance. (bolt x 6)
Firstly, remove the camshaft stopper, and then
drive a 6mm bolt into camshaft. Finally, remove
the camshaft and rocker arm.
Use a valve compressor to press the valve
spring.
After removed valve split locks, release the
compressor and then take out spring retainer,
valve spring and valves.
Caution
In order to avoid loosing spring elasticity, do
not press the spring too much. Thus, press
length is based on the valve split locks in
which can be removed.
Special Service Tool: Valve spring compressor
Or with the valve spring remover/installer to
compress the valve spring directly. Then, remove
the valve and valve spring.
Caution
In order 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.
Special Service Tool: Valve spring remover/
installer.
6-6
This chapter Contents
Valve split lock
Adjustment
hole cap
Stopper
Camshaft