300 main jet, clip in the middle position, stock pilot, completely cleaned out carb, float height is normal, air screw 1 and a half turns out, and it' not responsive right off idle mid and high range are great though. Also getting a hiccup/fart from under the seat. I can hear/feel it when I'm cruising in first at about 1/8 throttle getting ready to hammer it. Never did this before. Did the carb test and sprayed carb cleaner all around the carb, carb boot, intake side, no change in idle, no intake leaks whatsoever. Do tranny leaks and smokes as any two stroke should. Anyone have any suggestions??? KOR suggested a 300-310 main because right now it's at around 30-40 degreees by me in Illinois. Also ran it with the snorkel on AND OFF the bike. Please help!! I know I'm close to getting her running right it' just has to be a rich or lean issue