VESPA GTS Super 300 ie 2008 Service Station Manual page 192

Injection
Remove the gas command fitting as indicated in
the picture
Refitting the butterfly valve
To refit, perform the operations in the reverse or-
der from the removal operations being careful to
position the clip fixing the throttle body to the air
filter bellows at 45° as shown in the photograph.
INJEC - 192
Vespa GTS Super 300 ie (2008)