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It sounds like the scooter had a soft seize, from the stall, hot rubber, then started back up description. Soft seize = lean motor. Not good. That can easily be checked by removing the exhaust and looking at the piston bottom. Scrapes on the exhaust side of the piston mean the top end is done. If the piston looks correct, youre ok. You said you did an up-gear? Who pressed the gears? Did they space them correct, with the proper space? Did all the spacer washers go back in the correct location? A friend had a spacer washer on the wrong side and it let a gear shift just enough to lock them up. He was lucky the case didnt get a hole punched in it. Finally, fix the exhaust leak when you check the piston. The exhaust pulls excess heat off the motor and controls back pressure. Running a 2-stroke without one is even worse.
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