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 CVO navigation systems and iPod music players. CVO models are produced in Harley-Davidson's York, Pennsylvania plant, where touring and Softail models are also manufactured. In each model year, CVO models feature larger-displacement engines than the mainstream models, and these larger-displacement engines make their way into the normal "big twin" line within a few years when CVO models are again upgraded. Accessories created for these customized units are sometimes offered in the Harley-Davidson accessory catalog for all models in later years, but badging and paint are kept exclusively for CVO model owners, and cannot be replaced without providing proof of ownership to