DKW ULD 250

Machine-translated from the German article

The DKW ULD 250 is a racing motorcycle produced by Auto Union AG, which was used very successfully in motorcycle racing from 1937 to 1939. The DKW ULD 250, with a twin-piston two-stroke engine and a scavenging pump, was considered unbeatable in its class until the Second World War. As early as 1932, DKW's racing department developed two-stroke racing engines with twin pistons according to the Zoller system, meaning the crankshaft drive works with a main connecting rod on the crankshaft and an articulated secondary connecting rod for the second piston.