When I was young and poor, I had to repair the head gasket on an old 250 Honda motorcycle engine. The parts manual showed copper washers under the head bolts, but someone had been in there before me and there were no washers. Perhaps the reason for the gasket failure. The parts were already obsolete, and it was before ebay. A little sandpaper, four cents, a drill, and a bit of time. Put it all back together, and it ran great for about six months. Then it was stolen, so I have no idea how it turned out long term.