Had trouble this weekend with my 800. In the parking lot and 3\4 of the way up the hill it ran perfect , but when I got to the higher elevations it seemed to be running rich . It started great but at 1\2 to 3\4 throttle it was boggy but if opened it up it would clean its self out and be okay.8300 rpm. At the end of the day comming down the hill it ran perfect again. How do you check the altitude compensator or do you think it is something different?