It all depends what you have for pins in your clutch. Factory you are prolly at 3-4 at 6500-8000, and 5-6 at 10000. They say the clutches work better when you are set on a lower clicker. So I have mine set to run on 1 at 7000ft and 3 at 10,500ft or so. The 800HO has peak performance at 7850 and 800R can turn 8150 so depending on what motor you have just get it set to run at the peak rpm when you punch it down the trail at elevation and hang on.