At the motor show in Berlin in 1933, the plant Zündapp Werke, GmbH, in Nuremberg, has introduced a new series of motorcycles Series K. the Letter “K” in the title, pointed to the fact that the bike with cardan shaft.
Zündapp K 800 was equipped with a 4-cylinder, boxer engine with air cooling capacity of 20 HP at 4000 rpm, and represented both externally and internally is very competent and nice design. The first modification of the engine had bronze liners in the bottom heads of rods and bronze carburetor company PALAS, drive raspadura was carried out by means of the chain. The capacity of the first machines K 800 was 18 L. S. In 1935 the motorcycle is modification. The lower head of the connecting rod to get the needle bearings, the generator is driven by means of textolite gear, put in rubber damper, and, most importantly, installed a new carb Amal, the power increases up to 20 HP And in versions with accelerator pump power is 22 HP Changed the shape of the crankcase covers: the top and closing the carb.
Army version of motorcycle 800 K-W was highly favoured by the soldiers, but in this model due to insufficient cooling the rear cylinder spark often samakovlis. In the Wehrmacht there were about 550 units of the model K 800-W. Zündapp K 800 was and remains the only four-cylinder motorcycle in the service of the German army.