Harley-Davidson models. In the late summer of 1929, Harley-Davidson introduced its 45 cubic inches (737 cm³) flathead V-Twin to compete with the Indian 101 Scout and the Excelsior Super X. This was the "D" model, produced from 1929 to 1931. Riders of Indian motorcycles derisively referred to this model as the "three cylinder Harley" because the generator was upright and parallel to the front cylinder. The Great Depression began a few months after the introduction of their 45 cubic inch (737 cm³) model. Harley-Davidson's sales fell from 21,000 in 1929 to 3,703 in 1933. Despite this, Harley-Davidson unveiled a new lineup
Harley-Davidson XG750R drag racing success. The XG has a number of changes from the older XR750, reflecting newer technology. Harley-Davidson XG750R The Harley-Davidson XG750R is a competition-only motorcycle made by Harley-Davidson for flat track racing. It is powered by the fuel-injected, liquid-cooled Revolution X V-twin engine from the 2015 Harley-Davidson Street 750. It is the first all-new flat track racing motorcycle from Harley-Davidson in 44 years. It was first used in competition by Davis Fisher of the Harley-Davidson Screamin' Eagle Factory Team on April 9, 2016 in the GNC1 race at the AMA Pro Flat Track Circuit of the Americas Half-Mile. The