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 producing increased hydrocarbon and nitrogen oxide. Harley-Davidson is required to buy back and destroy any super tuners which do not meet Clean Air Act requirements and spend $3 million on air pollution mitigation. Harley Davidson is the main sponsor for Vizag Victors in IPL The Milwaukee Bucks of the National Basketball Association sport a Harley Davidson sponsor patch on their jerseys. According to a recent Harley-Davidson study, in 1987 half of all Harley riders were under age 35. Now, only 15 percent of Harley buyers are under 35, and as of 2005, the median age had risen to 46.7. In