Hi guys. I have an 03 z400 and just recently installed a HMF slipon, EHS lid, and changed the main out to a 170 (mikuni jet) and adjusted the fuel screw out 3/4 turn. It runs GREAT except it stumbles at the top of first. All other gears are perfect. Any suggestions? Too rich?

 

Are you sure youre not hitting the rev limiter?

 

Yeah I'm sure the rev limiter isn't the problem, but thanks for the thought. I'm going to try a 160 main and see what that does.