last in a 1945 Stuttgart bombing raid. From 1936 to 1938 Zündapp produced the KKS500 model. This was the first Zündapp with a foot gear change, and 170 examples were built. From 1940 onward Zündapp produced more than 18,000 units of the Zündapp KS 750. This is a sidecar outfit with a driven side wheel and a locking differential, supplied to the German Wehrmacht. Zündapp also made aircraft engines including the 9-092, which was used in light aircraft, including the Braunschweig LF-1 Zaunkönig (1942) ab initio trainer aircraft. Postwar: 1945–1984 After World War II the company transitioned to smaller machines, notably the "Bella" motor scooter, which was a relatively heavy machine for its type. In 1951 Zündapp released the last of its heavy motorcycle models, but one of its most famous: the KS601 (the "green elephant") with a 598 cc two-cylinder engine. From 1957 to 1958 the company also produced the Zündapp Janus microcar. In 1958 the company moved from Nuremberg to Munich. Subsequently, the company developed several new smaller models, discontinued the development of four-stroke engines and only produced two-stroke models. Zündapp experienced enormous success in off-road motorsports winning thousands of Gold-Silver and Bronze medals, many Championships. The American rider Dave Ekins won an overall victory at the 1967 Greenhorn Enduro aboard a 100cc Zündapp, defeating competitors on much larger motorcycles. Belgian rider André Malherbe rode a Zündapp to win the 125cc European motocross championships in 1973 and again in 1974. Initially, Zündapp scooters and mopeds sold well, but later sales declined and in 1984 the company went bankrupt and closed. New legislation had destroyed the market for Zündapps high-speed 50 cc "Kleinkrafträder": to reduce noise and to reduce the accidents especially young riders had on those bikes, the new "80 cc" class was introduced. That made it much easier especially for the japanese manufacturers to break into the previously protected market as they could easily downsize the 125 cc engines. Kreidler shared Zündapp's fate and went insolvent in 1982. Post bankruptcy After the bankruptcy, the entire production line and intellectual properties were bought by Xunda Motor Co., Tianjin, China. They produced small Zündapp motorcycles from 1987 till the early 1990s. Zündapp is still in business but makes Honda based 4-stroke motorcycles and electric mopeds. Zündapp also had a technical collaboration with Royal Enfield (India) to build mopeds and motorcycles. A dedicated factory was built at Ranipet near Madras