Was the Sta Bil in the gas when you were fogging it? If it was, you are good. If it wasn't, well there is a chance of gumming over the winter, but I don't think I'd worry about it. Draining the carb isn't too easy on that one, if I remember correctly. Before doing that, if it were me, I'd simply start it up again (with Sta-Bil) then disconnect the gas hose and re-fog as it runs out of gas. Hey, nothing lost but a bit of fogging oil.