Hi, Recently bought a scorpa easy 250 rotax. The carb needed setting up the seller said as it wouldnt start. set the carb up so that it starts but as soon as you give it half throttle, the bike decides to rev quite high randomly until you hit the cut out switch, any ideas what could be the problem?? the carb is returning though, so its not that

cheers nath

Throttle cable could be too tight or the throttle could be sticking on the bars?

No mate, as i said the slide is going back to the correct position.