So my neighbor comes over one day with an R/C gas engine and says, " Do you want it? It's free!!!" Of course I said yes . He took it from his boss who's father-in-law was into RC planes, and who has since passed. I don't know what size it is, or what it came off of but its pretty big. There is a mfg. plate on it that says USE engines made up in NY state somewhere, I think Albany. Has anyone ever heard of USE engines? A quick search came up for a lot of 'used' engines, but not USE engines. Thanks for any help! Pat