My mechanic warned about the effects of ethanol in the gas. He stated that it will deteriorate the components of the fuel system. He says he has seen a increased amount of these incidents in his shop.
In his Ducs, he uses a mixture of Seafoam and Stabil on every tank. He pours it in, and starts the bike, allowing the mixture go through the fuel system.
Works for him, Im using StaBil at the moment since I wont be able to ride for a few months.
Frank