PIAGGIO 633929(IT), Service Station Manual, Page: 139 / 314

Fit the pins and rocking levers.
- Lubricate the two rocking levers through the
holes at the top.
- Lubricate the 2 bearings and insert the cam shaft
in the cylinder head with the cams corresponding
to the rockers.
- Insert the retention plate and tighten the two
screws shown in the figure to the prescribed tor-
que.
Locking torques (N*m)
Plate screws 4 ÷ 6 Nm
Insert the spacer on the cam shaft.
- Rotate the engine so that the piston is at top dead
centre, using the reference marks on the flywheel
and the crankcase.
- Holding this position insert the chain on the cam-
shaft control pulley.
- Insert the pulley on the cam shaft while keeping
the reference 4V in correspondence with the ref-
erence mark on the head.
- Assemble the counterweight with the corre-
sponding fixing screw and tighten to the prescribed
torque.
Locking torques (N*m)
Counterweight screw 7 ÷ 8.5
Fit the end-of stroke ring on the valve-lifting mass
and fit the automatic valve-lifting cam to the cam-
shaft.
N.B.
LUBRICATE WITH GREASE THE END-OF-
STROKE RING IN ORDER TO AVOID ACCIDEN-
TAL LEAKS THAT MAY FALL INTO THE
ENGINE. ASSEMBLE THE AUTOMATIC
VALVE-LIFTER RETURN SPRING. DURING
THIS OPERATION THE SPRING MUST BE LOA-
DED AT APPROXIMATELY 180°.
MP3 125
Engine
ENG - 45