My question, stock KXF250 '06, I live in San Diego & ride mostly tracks. I have moved the clip down one (stock 2 - moved to 3) position and have the fuel screw out 2 1/4, the bike now does not backfire and has great response from 1/4 throttle to full, however from idle, cracking the throttle kills the bike almost every time. Plug looks ok, light brown, with some black around the threads. It idles good, just can't get not to die when cracking the throttle. Any help would be appreciated.
needle 3 position down from top
pilot jet stock
Motopro air screw 2 1/4 turns out.