Re: Answer for an old question...
Two strokes are pretty good about starting in cold weather. In the late 60s and early 70s I sold Yamaha snowmobiles in NW Alaska. I never had a problem getting a start down to -15f or so, below that it was a lot easier with a shot of ether. Not that they wouldn't start without ether but it took several pulls to loosen them up for a start without.
Goldwing 1500, Silverwing 600, Schwinn 49