It soon became apparent that the KS 750 was much better than the BMW R 75. BMW was ordered to build the KS 750 under license, but refused. BMW was then commissioned to adopt the sidecar wheel drive, hydraulic braking system and wheels designed by Küchen. In addition, BMW and Zündapp agreed to make as many parts as possible interchangeable, so that parts supply would be easier. In 1940, Zündapp delivered seven test units, and the Oberkommando declared in April of that year that the machine could be deployed. Production of the KS 750 began in the spring of 1941. Production continued even after the war until 1948. Nuremberg was in the American occupation zone after July 1945. After the war, just under 350 copies were produced. The BMW factory in Eisenach, which was located in the Soviet occupation zone, also tested models based on the R 75/ KS 750 after the war.

This Zündapp motorcycle dates from 1944 and is still in very nice condition. It still drives perfectly and everything works on this motorcycle. It is equipped with a Steib sidecar that is also powered. Anyone looking for a motorcycle with a sidecar from the 1940s does not have to search any longer.