i have had scooters do this but its because its is a leak or not tune right. (let it warm up for 5-10min)What you want to do is put the scooter on the center stand turn your a/f screw all the way in then back out 2 1/2 turns, then adjust the a/f screw in or out but what you are looking for when adjusting is the highest idle when you find the highest idle you adjustment is correct, then adjust your idle screw down were it idles good and and the wheel isn't spinning, see what that does for you plus a nice carb cleaning would be helpful first its hard to tell what was inside that thing before you got it, if that doesnt help look for loose vac lines
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