300 degrees is too high...lol kidding. i would think once you hit the 200 degree mark I would be looking for some snow to get up on the exchangers. just my opinion
Maybe Polaris are different, but my Cat would send the ECU into limp mode (cuts power) before it ever got to 200*. Personally, if I ever get to 160* I'm looking hard for some loose snow. My Cat runs 120* pretty consistently. I've read 120*-140* is pretty average for a 2-stroke...depends on your riding conditions also though.
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