Modern Vespa

why does my t5 when its on the centre stand its revvy and when i take it of the stand its idling properly. when i set the idling jet on the stand, and then take it of it simply dies out, what could it be?

It will most probably be the throttle cable thats too short (or snagged in the frame somwhere) so when its on the stand the engine sags and pulls the cable revving your engine .......... Bloody scooters ............ put a side stand on and you wont have to swap the cable

yeah it makes sense... thanks

when the bike is off the stand, bounce up and down on the seat if that changes the characteristics than it has nothing to do with the stand.

you more than likely don't have enough free play in the cable