my suggestion.... figure out what pilot is in the carb, figure out what needle is in the carb alone with where the clip is on the needle, and also figure out where the air screw is set at right now..... report back, then we can give ya a better idea of where to start with your jetting.... what mods are done to the bike? sounds to me either the pilot is plugged or way to small..... or you could have an air leak.....