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 FL including the FL models, were switched from the Evolution engine to the counterbalanced Twin Cam 88B engine specially developed for the rigid engine mounting in this frame. The FLSTN designation returned in 2005 with the Softail Deluxe. Harley-Davidson introduced the FLD Dyna Switchback in 2012. Designed to be reminiscent of the late 1950s Duo Glide models, the Switchback is the first Dyna platform motorcycle from Harley-Davidson to use an FL front end, and is marketed as a convertible model, with removable saddlebags and windscreen allowing the user to easily convert the bike for touring use. Harley-Davidson FL The Harley-Davidson FL