I came across this engine the other day and bought it as it was
pracrically new yet I know its more than 20 years old. Can anyone tell
me anything about it? Is there a place where I can go to read up on
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It seems that the 61SF manual isn't available as a .pdf download anymore. As I recall the 61 SF was available in both ABC, and Ringed versions. You will need to remove the muffler, and look into the cylinder (through the exhaust port), while turning the crankshaft by hand. Look for the presence of a piston ring ,at, or near, the top of the piston. You will need to know which version of the engine you have, should you ever need parts for it. The time to check is now before you mount the engine in a model.
I can tell you that it was a very well designed, long lasting, and powerful engine. If I had the choice today, between buying a new never run 61 SF, or it's current replacement in the OS line. I would take the SF, as I believe that it is a higher quality engine than it's replacement.
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Ken Barnes

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