Power bomb / Stroker combo

Apologies for yet another jetting questions.

I have purchased FMF power bomb header and stroker exhaust for 99 YZ400. I ride on east coast 0-2000 ft. Anybody running this combo at this elevation with advice for jetting / needle / air screw adjustment? Would appreciate assistance.

go to the wr website, having said that JD or CM may read this in the next few days & answer your call!


Hey Guys! I will be running a similar set up on a '99 YZ-400 also. My system is with a White E-series pro-meg with the high boy header pipe. I beleive the bike has stock jetting presently ( I bought used ) and I ride east-coast also 0-2500 ft. Any help would be greatly appreciated! :)

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