im really confused on my jetting situation,heres the deal 2003 kx 500 all stock even the brass, compression good with fresh top end, reeds, etc. mix fuel 93 octane klotz 32:1, elevation 2000ft, air temp 60deg. stock jetting is real rich so i droped main jet to a 165, pilot a 55, and needle clip to #2, air screw 2 turns out. bike ran cleaner but still had some studdering at 1/8 to 1/4 throttle, looked at porcilian of plug at base, had black ring half way up then rest was dark brown, so i leaned it out more. main 162, pilot 52, needle same clip #2 and airscrew 1.5 now my plug is still black half way up porcilian but rest way up is off white, from every thing i read there should be a brown ring a few millimeters up from base no black, my question is should i go to a 160 main? but every jetting chart i see from pro circuit to team greens all are at or close to stock jetting. i want max power but in order to get my plug to read right i need to lean it out beyound my comfort zone. should i go by the base of plug color or keep jetting to rich with what i got.
