Switch to a full synthetic oil approved for your atv if you’re not using it already. I run conventional Rotella 15-40 in mine as it’s hardly used in the cold anymore. I have the same issue you describe when running conventional when it’s bitter cold which we don’t see often where I live now. I switched to syn. before going to sturgeon bay chasing whitefish when it was -20 and had no issues that weekend or anytime I lived up north and ran syn. My choke cable broke one winter and I used starting fluid then a fast idle for about a minute. I keep a can in the toolbox still and use if needed vs paying almost triple for syn oil.

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