Yeah, I agree with that. I had a used, old, OS 61 SF that I bought from an estate sale, got it rather inexpensively. I took it home, put about a quart of fuel (regular glow fuel) in a small bucket, and just dropped the engine in there and let it soak for about a week. After I was done, I drained it thoroughly, and put it on a plane, a Tiger 60, by the way, and it started right up and ran just fine. It eventually needed bearings, but with all things considered, that was a cheap quality engine.

Chris has that engine (Overbored) on one of his planes. I gave it to him for his clipped wing Tiger 60/tail dragger. He replaced the bearings, and it flys today. A great engine.

So, never say die. Let them soak in something (I recommend just plain old 15% nitro is what I used, but any fuel with oil will work) for a while and then clean them out/off and see if they turn and if they have compression. If they do, then what the hell... put a new glow plug on, and start it up. You never know.

CGr