Do both, by the time you get the electric together you'll need it......

In all seriousness though, another point is that I doubt there's any re-sale market for that YS so any coin dropped on it would be a total loss when you're finished with it. You can also leave an electric sitting around in a plane for a couple of years, pop in a new battery and it's good to go.

I really feel obligated to run the YS at least every 2-3 weeks, because if I run it out and put oil in it, it fouls the plug next time out. Happend to me after a rebuild as well, put too much oil (only a couple of drops here and there) in everywhere when I put it together. Started first pop of the starter and ran fine for about 30 seconds, then died. Wound it with the starter only getting the occasional pops (plug fouled). Took ages and multiple plug pulls to get it to start and run long enough to clear the excess oil, lesson learned...