Have a lifan 125 on my 05crf50 has a 22 mil carb uni air filter inner rotary kit and exhaust ran great until the other day back fire real bad and bog I cleaned carb and new plug still ran rough so I put a brand new carb on it that just came in the mail with my buddy's piranha 140 from t bolt still acting up so i made sure grounds was good and exhaust was tight still acting up idles fine get on it and top end runs bad and coming down. What could it be? I'm stumped
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