Cylinder Head Installation - Sym EuroMX 125 Service Manual

6. Cylinder Head/Valve
Install the camshaft onto the cylinder head and
then the rocker arm and the rocker arm shaft.
Lock the lock plate after rotate the rocker arm
shaft to properly position.
Caution
There is different shapes on the top-end of
rocker arm shaft. The machined surface on
the rocker arm shaft has to face toward
exhaust side, and then the larger surface
has to align with the bolt hole of cylinder
h d

Cylinder Head Installation

Install the lock pins and new cylinder head
gasket onto the cylinder head.
Install the camshaft chain plate.
Install the cylinder head.
Tighten the 4 nuts onto the cylinder head top-end,
and then the 2 cylinder head mounting bolts on
its side.
Torque value: 2.0~2.4 kgf-m
Caution
This model is equipped with precious 4
valves mechanism so tighten torque can not
be over the limited value and tightening the
bolts diagonally by 2-3 sequences. It can
prevent from cylinder head deformation and
then cause noise or leaking problems so that
effect motorcycle's performance.
With T type wrench to turn crankshaft in a
clockwise motion so that the "T" mark on the
alternator flywheel aligns with the mark on
crankcase. (piston is at TDC position)
Place the TDC marks of the cam sprocket at
same level of the top-end of cylinder head. The
other single hole of the cam sprocket is in
upward. Then, install the cam chain onto the
cam sprocket.
Install the spark plug and tighten it.
Torque value: 1.0~1.2 kgf-m
6-14
This chapter Contents
EX rocker arm shaft
Lock pins
Lock plate
IN rocker arm shaft
Chain plate
Cylinder head gasket
Nut x 4 Bolt x 2
BTDC