I got a 2003 KX 250 and so far it dosn't seem to want to idle. I starts up first or second kick cold and goes good with the choke on but its deffinatly running rich. The plug is oily and black sooty looking. The jets are a 160 needle and 48 main jet (or did I get those backwards ?). I dont know where the needle is set yet or the fuel screw. Anyways I need ball park figures for running in sea level in california between 40 and 50 degrees and running 40:1 mix. Thanks!