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Jetting tips

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Hi I am in need of some tips. I have a 2012 yfz 450 with some jetting issues. I have a 500 stroker kit on it. I've ported and polished it. Dr.d type 2003 full exhaust. I recently went from the mikuni bsr carb to the fcr carb. I' now having some hanging throttle and backfire issues. I am running a 50 pilot and a 185 main. Just need a little guidance please 

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