Try "carb heaters" in the search function. You will find it a common question. Since most of the best have been answered already, I am sure it will be more fruitful than getting folks to reply to this topic again.
Only use them when you fear icing. Otherwise leave them off. What do you think ALL of the others sleds do without them. Just so you know, Ski-doo is the ONLY one currently offering them. Tells you something. Have fun!
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