Inspecting The Cam Shaft - PIAGGIO MSS X9 Evolution 250 Workshop Manual

Engine
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 seal
rings.
- 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 POSITION. FIT THE
VALVE SPRINGS WITH THE REFERENCE COLOUR ON
COTTER SIDE (TURNS WITH GREATER PITCH).
Specific tooling
020306Y Punch valve seal rings fitting
020382Y Valve cotters equipped with part 012
removal tool
020382Y011 adapter for valve removal tool

Inspecting the cam shaft

- Inspect the camshaft for signs of abnormal wear
on the cams.
- Check the cam height.
- Check there is no wear on the camshaft retaining
plate and its associated groove on the camshaft.
- If any of the above dimensions are outside the
specified limits, or there are signs of excessive
wear, replace the defective components with new
ones.
- Check there are no signs of wear on the auto-
matic valve-lifter cam, or the end-of stroke roller,
or the rubber buffer on the automatic valve-lifter
retaining cover.
- Check that the valve lifter spring has not yielded.
- Replace any defective or worn components.
- Check the rocking lever pins do not show signs
of wear or scoring.
ENG - 126
MSS X9 Evolution 250