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Jetting For A Modified 05 Crf450r

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undefined I HAVE O5 CRF450R WITH A TI4 PROCIRCUIT FULL SYSTEM, POWER NOW INSERT, AND A K&N EXTREME AIR FILTER, DOES ANYONE KNOW WHAT JETTING WOULD BEST SUIT THIS SET UP..???THANKS

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Im kinda in the same boat. I have a 2004 CRF 450 with a white brothers Carbon Pro exhaust system, The powernow system, and a twinair powerflow system, plus i have a boysen accelator pump cover and i have no idea what the jetting should be either if you find anything out write me and let me know.

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your best bet is to ride the bike and adress any issues it may have.your set up is nto far from stock.

the kn xtreme filters take 1-2 size bigger main jet in general over a stock filter with back fire screen.but the power now usually uses leaner jetting.

test ride and report.

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