I know this is an old topic but my search has not quite come up with what I want. I have a 98YZ 400 when you crank the throttle open after its warm sometimes the throttle shuts and then I get a high idle for 10 seconds or so and then it drops to normal. cleaned carb, adjusted cables, checked for leaks blah blah blah. What in the H am I missing!!! Please help tters!!!