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fmf jetting for 426

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i just put on a fmf powercore silencer and a power bomb header....it ran fine untill i opened it up on the dirt...it was backfiring like crazy.....do i need to rejet it?..ive never jetted it b4 so i would not kow how to do it...is it dificult?...what would i need?..any help is appreciated..

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