I would take a wide open pass about 1/2 mile at wide open. While holding the throttle to the pin, hit the kill switch and let the sled stop. Pull the plugs and check the plug color.
If the plugs are white or grey, the main is too small, you are lean. Go bigger on the main.
If the plugs are black, you are rich and can safely jet smaller on the main.
You are looking for a cardboard brown color on the plugs.
You can also look at the piston crown for piston wash. Piston wash is the area on the piston crown that is cleaned off by the fresh fuel/air as it enters the cylinder.
Put the piston at bottom dead center, use a small light (bend-a-light, or small LED's work great). You are looking at the piston crown where the fuel/air enters at the intake ports. Good piston wash will be about the size of a thumbnail. If you are rich, a bigger area of the crown will be washed. If the mix is lean, there will be no piston wash.
It's better to be too rich than too lean. Too lean will increase cylinder temperatures to the point that you can melt a hole in the piston.
Once you have the main selected, go back and do the same ride test at mid-range. That will set the needle height.
The 1/4 throttle to 3/4 throttle fuel/air is metered by the needle jet/jet needle as it comes from the main. At about 3/4 throttle, the needle is clear of the jet and the main is metering. If you lean out the main, you also lean out the needle jet/jet needle and may have to lower the clip (raise the needle) a notch to compensate. Testing will tell.
2007 RMK 700, 2008 RMK 600, 1995 AC Prowler 2-up, 1980? AC Cheetah