I have a 66 Harley M50 that my Great Uncle gave me when I was a kid for a small engine project. I got it running and raced my brother who was on a Rupp mini bike on a flat oval track we made in a pasture. We had a blast back then! I regeared the Harley with a bicycle crank sprocket. The Harley was great in the turns but the Rupp was a little faster in the straights making them an equal match. The Harley finaly blew the rings out the exhaust and the Rupp's rear wheel kept falling off. The Rupp got sold for $50. but I still have the Harley and want to restore it someday after my Super Bronc project. Any ideas where I could get parts for it? The gas tank is full of rust inside, whats the best way to fix it? Thanks, Ash