Used condition vintage Moki 10cc (61) RC nitro ringed engine in reasonable clean and good condition for its age - no muffler is included, just what you see is what you get. Everything feels smooth and free and I think it should be a good runner, from what I've heard Moki engines are strong and reliable powerplants.
I haven't ran this myself, I've bought it recently with other items but is unlikely I'll use it anytime soon.
Price is $95 including postage in Australia