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Last tune up? Re-check/replace points; plugs; timing; whatever you got. tip: just cause it was OK the last time you looked, doesn't mean it's OK now. It is more likely the spark. Replace the plug. If it is not the plug then it is the gas. Did you let the bike sit for a loooooong time? If you did the gas may have broken down and clogged the main jet of the carb. Disasssemble, clean with lacquer thinner, scrub with a mild wire brush, rinse with gas and reassemble. Y-THINK-Y

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Q: What is wrong if a 50cc turns over and idles for a few seconds but then backfires and quits and cleaning the carbohydrates did not help?
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