Only experience I have with them is from the 2007 Yamaha Phazar Mountain Lite my father in law had (he just traded it in this year). That sled was no good for starting in cold weather and I would not catch myself out on the ice with it if I knew temps were going below 0. I was up there last month and we could not get it started one morning at his house, but it did start later that day once it warmed up. The two strokes fired right up.
Not sure how other brands do in cold weather?