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bummer ... did you take compression readings before / after? i would just pop the cyl off and inspect at a high level first, engine builder is just gonna say, 'uh, you ride this thing on the street' ... 80:1 mix makes me cringe that puppy should live on 32 ... could be something simple like dirt ingestion or premature ring wear so i wouldn't freak out yet. if you don't want to take cyl off, could pull pipe and peek into the exhaust port as a first step.