In 1969 Jaroslaw Janoski designed the prototype of his Saturn 500 engine.

“25 CV”

-This 2-stoke engine had two opposite horizontally-opposed cylinders, and gave 25 hp (later made another one that gave 30 hp and was lighter).

“30 CV”

-The Jaroslaw Janoski engines were built by S. Polawski, in the city of Lodz. The 25 hp was made until 1988. The 30 hp version had double ignition.