I use fuel additive in the bikes when storing,and fill the tanks completely full. In the spring,I just drain the tank and run the fuel half and half with fresh fuel,in the lawn mower.. Since we mow a lot,it is soon burned up. I would rather risk a cheap mower engine to the old fuel than a nice motorcycle engine,but that's just me,so do what you want.
I inherited an old small engine stored for 10 years with Sta-bil, and there was no rotten gas smell. I could not believe that it started on the second pull,but instead of running the old stuff through the engine,I put fresh gas in there and used it that way. Used the old gas to burn a brush pile.