If I used regular fuel, ethanol or non ethanol, I'd drain the bowls before letting the bike sit for any length of time. But I use avgas because of the f/g tank I have and the nice thing about it is it evaporates in a couple hours. I can let the bike sit for a year, turn on the petcocks, fill the bowls, tickle it and it starts right up. It's a matter of not letting that crap gas sit in your carbs and foul the jets. My opinion only.