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Here's my problem. Scooter (Yamaha Jog 1996 - 50cc) starts fine, idles and starts off ok. When you really twist the throttle to go, it stalls. If you lift the rear wheel off the ground it screams, no sputters, no stall. If you hold the rear brake, with the wheel off the ground it does the stall. I have just put everything back together after a paint job. No pinched vent or vacuum lines, already checked. I did have the rear wheel off to paint, the nut was so tight I had to use an impact to remove it. Is it possible I spun something in the drive? And could a drive problem cause this condition? Here's the really bad news, I have no manual and I'm a Harley tech by profession, can anybody help me?