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Installed bore kit, now xr50 sputters and backfires

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i got the whole kit with head, carb, oil pump. etc.

installed yesterday, heat cycled it and took it out for an easy ride around my street. however, when i turn it more than 1/4 throttle it sputters or backfires. at one point i saw some white smoke blow out so i stopped immediately.

what could it be? i really don't have a clue on this. I was thinking the carb maybe? i have a jet kit so i can change them...

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  • 2 months later...

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