Hello Everyone, I am hoping someone can assist me with some ballpark ranges. I have a stock 400ex that I’ve purchased a Yoshimura RS3 Full Exhaust system for, with a Uni filter and I plan on running with no lid. Could anyone give me the ranges of Keihin Main’s I should get to start my plug chopping as well as needle adjustments? Running a 42 Pilot.

2,100ft altitude and now that summer is here 80 to 120 degree temperatures outside. Barstow, CA.