I just got my 450X and seem to have a carburetor problem that I can't fix. It felt lean when I got it, the engine didn't return to idle after opening the throttle, it would idle about twice as fast as it should until I let the clutch out a little and that would drag the engine speed down to idle. If I gave it gas again it would keep the high idle until I let the clutch out. I backed out the fuel screw to 3 turns and the same thing kept happening. I put in the next size pilot and it still does the same thing, fuel screw is out 1.5 turns now. Occasionally if I twist the throttle closed really tight it seems to drop down to idle. I'm lost, any suggestions?