[mrlmd1]

If it's that cold for an extended period of time and you don't run the bike every day for a half hour or so, it might pay to keep the battery hooked up to a small charger to keep it topped up, That might be part of your problem. And a dead battery can freeze, and then it'll never be the same, may never work again.

I don't use my bike every day but even when cold it starts within a few seconds with 3/4-full choke, then as it races, slowly turn down the choke, wait 30 seconds, turn it down more, start riding. It never stalls. I have the choke off within a minute or so and maybe one block of riding. It warms up pretty fast, just be gentle with it for the first 1/2 mile or so and you won't have any problems.