Puch stutters,bogs, and backfires.

Button Rojo /
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So it is a stock za with a jammy pipe.I have drained the tank.Put in a new plug.Taken the head, and jug off. The piston, and rings are good.The exhaust port is not cloges.The timing seems to be correct.I put a new spark plug wire, and cap on.I also tried upjetting.It seemed to run better with a colder plug.Going uphill it backfires the most.Sometimes it shuts off after a backfire.I am running out of ideals.Can anyone offer me some other ideas to check for?

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