If I remember correctly, the "high altitude kits" that Polaris has for their machines include changing jets and clutch mods (I believe it is different weights). Now, obviously, the jet change is not needed in your case, but talk to your dealer about the high altitude kit for clutching changes

 

Ya, I talked with Dalton clutches and they have a spring and spacer kit that is made for the EFI and made to run at altitudes above 6000 feet.....I haven't ordered one yet, still want to talk with Dan from Heelclicker since he seems pretty knowledgeable on clutches....

thanks
dave