If the tank is full you can empty it, as dog has said if it runs then throw 1/2 can of seafoam in there with it and run that through, run the other half a can through your next tank as well, that should help allot with any varnish etc in the carbs, sometimes it takes a few tanks with seafoam to clean it out, your bike will actually run on the stuff, its not uncommon to run sea foam straight hooked up directly to the fuel line. You have new battery so good, as for th fluids etc, depends on when they were last changed, you can go with the mialage or the time.
