What jetting in mighty Mich!?

[MichiYZ400]

Ok jetting guru's, heres the stats. 98 YZ400f, non mx used, woods only, 14/51 gearing, Stock head pipe,FMF power core2sa,stock jetting. I'm getting hesitation at WFO throttle when the engine gets near the rev limiter. Does this require just a main jet change, or the pilot jet as well? BTW 300+ sea level and in Michigan ( the weather can be 90+ one day and 50 the next ). Any Mich riders input especially wanted on what your experiences with jetting this beast!

 

[MichiYZ400]

All you lurkers, and not one response! Sheesh...Does no one have any info or input? BTW just got an e-mail from FMF on this subject so it's no biggie ). Was just fishing around for Mich riders and their setups...guess I'm the only one that rides in Michigan!