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View Full Version : basic jetting and the 300.



MTDman11
06-02-2008, 04:46 PM
heres the deal i got a k&n, white bros header e series i think and hmf sport exhaust. it backfires on the decel and runs hot, melts my riding pants. so its running lean i suppose. im ganna get the next 5 sizes up from stock and for main and 2 up for the other i cant think of the name of it now lol. what are the stock sizes. also any tips or tricks that can help me. am i in the right direction?

fmftrx300ex
06-03-2008, 07:45 PM
ya im runing a fmf powercore 4 full system no arestor and an open box with a uni and i run a 128 rember to ajust feul air mixture screw