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So the bike is doing this with both carbs. The carb is the last video is a mikuni with a 110 main, fuel mix backed out 2 1/2 turns, and I've messed with the idle a bunch.
New plug just yesterday morning, when I pulled it out today it's black, but still sparking.
Jeffrey, I honestly can't imagine how that would help. I'm no expert and I may do it out of desperation... but if there was a vacuum leak there, wouldn't it be running lean? Therefore running better with airbox connected and choke on? Not backfiring? As of now it seems to be either running rich or not burning the fuel properly. Plus, I took it off and inspected it and the gasket. It looks fine.
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