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Running rich is causing your plugs to foul, not the other way around. Your jetting is rich for the temperature and elevation. It may be fine once the weather cools off and you are on the snow.

Polaris jetting charts are pretty rich, plugs are cheaper than warranty claims for holes in the pistons ;) If it's cold out and you put a tank of gas through the sled and the plugs look like that, you may be able to drop the main jet down a size. 120 is ok for compression, not stellar. A lot of times on Polaris sleds I have had in the past, if you hold the throttle wide open when starting after it's been running for a while, it seems to start easier. That was really apparent on the Edge sleds I had over the years. Be prepared to let go of the throttle when it starts, though!
 
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