PIAGGIO MSS X9 EVOLUTION 250 Workshop Manual page 164

Engine
N.B.
THE VALVE CAN BE INSERTED IN ONLY ONE POSSIBLE
POSITION.
- Reassemble the spring with the pin lock.
- Remove the cover of the vacuum chamber being
careful to correctly insert the spring in its place on
the cover.
- Tighten the screws.
- Wash and blow dry the filter sponge of the am-
bient pressure intake.
ENG - 164
MSS X9 Evolution 250