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04 crf 50 wont run right after rebuild of tb 88 kit

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i just rebuilt my 50 with a tb 88 for the second time and i some how i got the timing missed up because when i went to kick it over it bound up so i reset the timing again and than it started. i think i got it right but i m not sure. To start it i have to give it lost of gas and it doesn't seem to run right and backfires gas out of the carb so the more i think about it the more i think that i might be off a tooth or something. it wouldn't idle either so i went thought the card and cleaned it and its spot less... any suggestions would be great ... thanks

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pull the cam cover off and be sure it is in the correct postion while the motor is at TDC. How did it run before the BB kit? What carb? What kit?

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Hopefully its not a stock carb on an 88. hopefully at least a 20mm. sounds like a jetting issue if the timing is right

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