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about a month ago i was fighting with the exact same problem, but it was fixed by jetting my carb pretty far down, changing the rods and playing with the timing a little bit. i had the afterburn at the exhaust and backfires at the carb just like you....usually the ones at the carb mean you need to tune that thing or a spark wire is misplaced and the misses were all caused by fouled out plugs
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