Damn,
I can honestly say that I have started mine up down to 20 degrees and though she was a little stuborn and may have required a couple of start cycles, she always fired up.
When it has been that cold, normally a slight bit on the, tow twist of throttle, a small amount of enricher and then crank for a few seconds. She almost always tries to fire if not fire. When it did not fire, just waited a couple of min and then gave another twist on throttle and normally she went.
Then it was just babying the throttle for a few min with no enricher on until she setteled out.
I will say that I was always grimmacing wondering how good it cold be since she was cold, but so far never seemed to be an issues after she got warmed up and I took it slow for the first few min to make sure the fluids cycled good.
I will keep the starting fluid shot in mind next time if there is any problems.