I always used to put stabil in my snowmobiles and I still put it in the lawnmowers but the bikes stay in my heated shop all winter and I, like Tom get them out and ride them when I can. If I can't due to weather, I at least start and warm them up every week.
I had a couple of friends that used Stabil in their sleds and wound up with gummed up carbs. I think I'd drain the fuel and run it dry then fog the inside of the fuel tank before I used stabil owing to my friends experience with their sleds. I've never had a problem with the lawnmower but I do add some B12 Chemtool in the spring upon startup.