It's a vintage Kohler KT series engine cylinder. It's identified by the nine symmetrical head bolts and the two notched cooling fins at the bottom of the jug (cylinder). You'll have to measure the bore and stroke to tell exactly which displacement engine it is. There're the KT17 (series I and II), the KT19 (series I and II) and last the KT21. The engines are two cylinder opposed engines, they used two of the same cylinders depending on displacement. These Kohler engines were used on many different applications: tillers, mowers, lawn tractors, go-carts and mini-bikes. They were also sold under trade names such as John Deer, Cub and others. There were also some single cylinder engines that used only one of the cylinders. It's a tough as nails design but expensive to manufacture. The website below has a wealth of Kohler info. Scroll down to the KT section to see your head bolt pattern and displacement options.

It's a vintage Kohler KT series engine cylinder. It's identified by the nine symmetrical head bolts and the two notched cooling fins at the bottom of the jug (cylinder). You'll have to measure the bore and stroke to tell exactly which displacement engine it is. There're the KT17 (series I and II), the KT19 (series I and II) and last the KT21. The engines are two cylinder opposed engines, they used two of the same cylinders depending on displacement. These Kohler engines were used on many different applications: tillers, mowers, lawn tractors, go-carts and mini-bikes. They were also sold under trade names such as John Deer, Cub and others. There were also some single cylinder engines that used only one of the cylinders. It's a tough as nails design but expensive to manufacture. The website below has a wealth of Kohler info. Scroll down to the KT section to see your head bolt pattern and displacement options.

References:

http://gardentractorpullingtips.com/engine.htm