Ok guys, my trusty 318 quit on me last night.
Its been a trooper for the last 2 weeks, clearing snow, at least 3-hrs. a week, didn't skip a beat.
Anyway last night I started it to make a spot for a trailer, it got warm and when I was putting the trailer into position with it, it died.
Its seems i can get it started again with the choke, then it will run for a bit under full choke, and when I open up the choke to let more air in it dies.
I was able to get it back in the shed, by opening and closing the choke when I heard it about to stall out.
My first thought is gas line antifreeze, it was -16 last night and with the wind chill it was -29. I store it in an unheated shed out of the wind.
So before I left for work I tossed the little ceramic heater underneath, and I'm going to put some antifreeze in the fuel.