Bike idles but won't throttle

My vespa T5 125 1999 idles ok but as soon as I throttle it a tiny bit it cuts out and stops running I've changed the spark plug took the carb out 3 times now and stripped it down and cleaned it over and over again just to make sure I havnt missed anything the jets arnt blocked I've checked my fuel line for blocked or damage but all seems fine, I have noticed though that without the air filter on it spits back fuel out of the carb and with the filter on it bubbles out the top of the bolt holding the filter down and leaks out the mixture screw at the bottom. I need help I have no idea what it could be. Would anyone have any idea please.

Thank you

Re: Bike idles but won't throttle

Moped Lar (OFMC) /

This is a pedal assisted, vintage moped forum, not a scooter forum. You'd be better served going to the Modern Vespa Forum.

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