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93 rm 125 not starting

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Alright, so just got a non-running 93 rm 125 with a brand new top end. The issue I'm having is when I try to start it, it sometimes fire for very little time or it will just cough. I just cleaned the carb and the spark plug Is basically brand new, I'm thinking it's jetting, I have a keihin pj I think 38mm since it has two vent tubes, as this is not the stock carb what jetting would be good? I also have a pro circuit pipe and silencer





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