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You either adjust the chain incorrectly or have bad swing arm bearings - it appears to me the axle is being pulled forward under acceleration causing excessive slack in the chain, the chain then rides to the top of the teeth of the sprocket and the chain walks off the sprocket.

Actually, the entire drive line needs to be inspected and rebuilt - there may be a problem with the transmission, a missing chain guide, bad swing arm bearings, a crack in the swing arm, a crack in the frame or other undiscovered problem.
 
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