I had an old OS 61 SF that I bought at an estate sale. It was pretty gummed up and I wasn't sure if it would run. Well, I put it in a bucket, poured some old fuel over it, covered it, and let it set for about a week. I took it out, drained it real well, put it on a starting block, fueled up a tank, and started it. It ran just fine.

Shows that there is life in those old engines.

CGr.