I'm a big fan of the dial-a-jet if your going up to altitude and back down frequently. My quad has it and it take me 5 minutes to be jetted at 8000ft. and another 5 minutes once I'm back on the desert floor.
Basically, you jet your carb for the highest altitude your gonna ride. Install the dial-a-jet and when you go back down to sea level you adjust the system to provide more fuel as your pulling in more air. Eliminates lean conditions.
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