Inspecting The Springs And Half-Cones; Refitting The Valves - PIAGGIO 633929(IT) Service Station Manual

Engine

Inspecting the springs and half-cones

- Check that the upper spring caps and the cotter
halves show no signs of abnormal wear.

Refitting the valves

- Lubricate the valve guides with engine oil.
- Place the valve spring supports on the head.
- Using the special punch, fit the four valve seals.
- Fit the valves, the springs and the caps. Using
the appropriate tool with adapter, compress the
springs and insert the cotters in their seats.
N.B.
DO NOT CHANGE THE VALVE FITTING POSI-
TION. FIT THE VALVE SPRINGS WITH THE
REFERENCE COLOUR ON COTTER SIDE
(TURNS WITH GREATER PITCH).
Specific tooling
020306Y Punch for assembling valve seal
rings
020382Y Valve cotters equipped with part 012
removal tool
020382Y011 adapter for valve removal tool
ENG - 42
MP3 125