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88kit carb question....

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working on my buddys 05 crf 50 with an 88 kit in it, not sure what kit he bought though.....

cleaned carb out, carb is a kiehin i know that, pilot jet clean, main jet clean. i know the pilot is a 35, but what size is the main jet?

reason I'm asking is because i modded his stock exhaust (removed baffle inside of pipe) and now its backfiring when i let off from WOT... i know i need to go up a size or two on the main jet to correct this issue. but i need to know what size his main is... might be an 89? ill try and get a pic of the carb up....

Thanks guys!

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