Sitting a year should be no big deal and even if the gas is bad you're not going to hurt the bike by starting it and running it. I bought a 99 Ninja 250 for my son, was sitting in storage with gas in it for three years, it started but smoked real bad. On the way to get the bike, got a flat on the trailer, ended up leaving the trailer, had my wife drive the truck home and I ended up riding the Ninja home, 45 miles, ran like crap, smoked a lot. Got it home, tore down the carbs, cleaned them and put new seals in, put them back on the bike adjusted the air mixture and she ran like brand new. Did the same thing with a GS500F I had, was sitting for a couple years, rode it home about 30 miles or so, ran rough (but not as bad as the Ninja), cleaned the carbs and she ran like new again. Start the bike and see how it runs.. if it's rough drain the gas and put some fresh gas in, if it still runs rough clean the carbs and you're in business.