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shorty to fmf Q

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i have a 2003 Rm 125 and i am looking to get a FMF shorty do you think i will have to rejet ?? this bike also has a boysen reed block i didnt no weather this would make a difference ??

thanks

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I didn't have to re jet going from a bills pipe shorty to a pro circuit nature friendly S/A muffler on my 2003 rm125 so i doubt you would have to.

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never mind what i just said, i do have to rejet it, after a day of riding there was gas running all down my muffler, maybe I'll take a picture later. The bike is running alot richer now with my PC muffler

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