Last night I put my old ATC on the battery charger and cranked it over after it has been sitting for a few months without being started. Of course I knew it would not start as it had been sitting with untreated shiit gas in it. Unlike my seasonal vehicles, I occasionaly use this thing year round although it's main mission is for drunken ice racing at a friend's man made ice track a few times each winter.
So..... after cranking over a few times and getting absolutely no response, I decide to open the carb drain screw to see what comes out.... nothing. Off comes the tank and carb. The problem "this" time ended up being a varnished/stuck float needle (and of coarse the float bowl had a bunch of crap in the bottom). A quick cleaning fixed the problem and luckily this time the pilot and main jets were not plugged.
This is a typical scenario for me with nearly all my carburated gasoline engines... especially the ones that are not "seasonal" but sometimes happen to sit unused for a month or so. I HATE MODERN CRAP GAS!