my yfz is an 04. i have a complete yosh ex.,k&n,no box lid,and a dynojet kit. The kit comes with a 48 pilot. according to the instructions I should run a 144 main and set on the #5 pos. on the needle. with this it stalls and sputters all the time. i moved to the #4 pos and this helped. now it sputters at about half throttle. it idles good and is good wot. i have the fuel screw at one and a half turns. this is where it seems to do the best. I live at about 1100ft. above sea level and the temp today was about 65. if anyone could help me get rid of this stall, i would really appreciate it.