Inspecting The Valve Sealings - PIAGGIO MP3 500 ie SPORT Business LT (2011) User Manual

MP3 500 ie SPORT Business LT (2011)
IF THE CHAIN HAS DAMAGED THE PINION, REPLACE THE CRANKSHAFT AS DESCRIBED IN
CHAPTER CRANKCASE AND CRANKSHAFT.
Chain tensioner:
- Remove the centre screw with the washer and
the tensioner spring. Check that the one-way
mechanism is not worn.
- Check the condition of the tensioner spring.
- If examples of wear are found, replace the whole
unit.

Inspecting the valve sealings

- Visually inspect the valve sealing surface.
CAUTION
DO NOT REVERSE THE FITTING POSITIONS OF THE VALVES (RIGHT - LEFT).
- If the sealing surface of the valve is found to be
interrupted at one or more points or is not flat, re-
place the valve.
- Insert the valves into the cylinder head.
- Alternatively check the intake and exhaust
valves.
- The test is carried out by filling the manifold with
petrol and checking that the head does not ooze
through the valves when these are just pressed
with the fingers.
Engine
ENG - 159