Jim; You may be disappointed even if you could get the top coat off without affecting the factory paint. My guess is the previous owner repainted for a reason. They may have done some sanding to prep for paint, as well. It may be worth a shot however to try your luck with lacquer thinner on a Viva paper towel on an inconspicuous area, like the bottom of the kickstand bridge if so equipped. This will remove weaker enamel (and lacquer, obviously) paints with a little patience, but the factory finish is usually tough enough not to be affected. I've even used acetone to remove rattle-can paint and factory graphics, but you have pay attention and stop rubbing for a couple hours if you feel the factory paint start to soften.