My bike always ran choppy. Something was wrong with it missing and caring on muffler would pop. I messed with spark plugs and the gap did not help. Finaly, I took the magnito off and cleaned it with tishue paper. Then I took an emory board and filed where the black wire grounds on the magnito. When I started it up it ran better than it ever has. I do not know if it was the ground or cleaning, but I just got it up to 31mph, and it still had some left. I have only ran about 1 and 1/2 of gas through it so I only did it for about 10 seconds. Wow, what an improvement.
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