I have a 1998 YZ 400 with Idling problems. I took the carb all apart and cleaned it good and replaced the idle jet with a stock one. I set the neddle jet to 1 1/2 turns out from bottom. It seem that it can't seem to find a happy spot to Idle. First it idles really fast and than when I either pull the choke in and out really fast or pull the hot start in and out it seem to idle back to where almost quits. When I rev it up again it starts the fast idle all over again. I try to up the idle stop and than It wants to Idle too fast again. .I am trying to figure out what to do next. Has Anyone experienced this problem on there bike???