After experiencing the same thing a couple of years ago I now fill the bike with ethanol free gas treated fuel stabilizer, ride the bike 20-30 miles to get it in the carbs then put it up for the winter. I leave the bowls full and every few weeks flip the key on to keep them full.
To unstick the previously mentioned stuck float, I ended up draining the carbs and filling them with Berryman B12. I misted the carbs with gas to keep the bike running and pull the B12 into all the circuits, let it set for a day or two then drained the bowls, flipped the key to fill with fresh gas, fired up with no more stuck float.
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