Kioritz engines are made by Echo, which is one of the top brands of yard equipment, right up there with Stihl. The old 16cc engine is cute but underpowered for it's weight. The 21 and 24cc engines look identical, and are great little engines. I have converted many of them for myself and customers and they really work super. Unless they have been changed already, the stock carb is small and the muffler restrictive. Fixing those two little problems results in respectable power. I have several of these flying in my fleet right now. They are also the engines used by FPE engines.

They make the 16cc as mentioned, a 21.2cc, a 23.6cc, and a 25cc. The 23.6cc is the best of them, and looks exactly like the 21.2cc so the only way to tell them apart is by measuring the bore and stroke. The 16cc has a much smaller cylinder, and the 25cc has a larger cylinder with the cylinder bolts going through the cooling fins.

It depends on the condition of the engine, and the quality of the conversion, but it could be a very good little engine you have found.

AV8TOR