I have an 01 KDX220. It has FMF pipe (not sure which one), modified air box, and I was told the carb has been bored. It ran fine since I bought it about 4 months ago. I ran some bad gas through it and it died while riding. I took the carb apart and cleaned it. It has a 160 main, a 45 pilot, and the clip is set 2nd notch from the top. It has always smoked a little and has some spoog, but I do not ride very hard. Now since I have put it back together, it fouls plugs after a few minutes of riding. The plug is very wet with oil. I have tried adjusting the air screw but it dows not help. Oh, I am running 40:1 ratio also. Everything is set up the way it was before the bad gas and I never fouled a plug before. What am I doing wrong????? Any suggestions welcome..... :aj: