Keni was the name of a German motorcycle manufacturer . The Kempff & Nimtz - engine Ges.mbH was established in 1921. They built light motorcycles and installation engines with 145 and 158 cc than two-stroke engines , which were easy to spot-cylinder cooling fins on the square. On request, models with a two-speed gearbox, optionally also with disc wheels, were available. The engine was tilted forward and built into the frame closed at the bottom. Production ended in 1925.