Idles, dies under load KFX400
I believe it is a 03, stock carb, 160 main, 25 piliot, 2.5 turns on a/f screw, k&n filter no lid, new plug, slip on pipe. It starts and idles good, choke functions properly, if you rev it in neutral it revs with out hesitation. If you try to drive it it sputters at 1/4 throttle or less and dies if you don't play with the throttle to get it past that point then it pulls hard. I also put fresh gas in, cleaned the carb, running the petcock in prime doesn't make a differance, and fuel flows good. My buddy just bought it so i don't know any history on it. Any ideas or help would great.