PIAGGIO 633929(IT) Service Station Manual page 160

Engine
- Remove the 2 screws and the starter support with
the gasket.
- Remove the 4 fixing screws shown in the figure
and the vacuum chamber cover.
WARNING
DURING THE REMOVAL OF THE CARBURET-
TOR COVER TAKE SPECIAL CARE NOT TO
RELEASE THE SPRING ACCIDENTALLY.
- Remove the vacuum valve together with the di-
aphragm.
ENG - 66
MP3 125