The flywheel will fit. The problem is getting a starter that will work. The solenoid shift starters for the gxv I think has the right gear, but they are hard to find. They came on the Honda 3000 series rear engine riders, 3009 and 3011 models. They stopped making them in the early 90's and I don't recall seeing that type of starter used on anything else. Probably still get one thru parts but would cost more than flywheel. Last one I had I sold to Ken Jones. keep an eye on ebay or craigslist, you might get lucky.
Chuck Miller