25 hp, 45 cu. in. V-twin engine, three-speed transmission, leading-link front fork with springs, rigidly mounted rear wheel, and rear brake.

During the late-1920s, Harley-Davidson expanded its model line with a mid-sized motorcycle that was envisioned to provide an entry level model for beginning riders, as well as a suitable basis for dirt track racing. The introduction of this new model was a very bold move, given the popularity of the 45-cubic inch V-twin-powered Indian Scout that was introduced in 1927.

Harley-Davidson designed a new 45-cubic inch V-twin engine with a side-valve, or “flathead,” cylinder head configuration, in contrast to the prior F-head design. Taking pains to avoid any risk of patent infringement arising from similarities to Indian’s design, Harley-Davidson contracted the design of its cylinder heads to the well-respected Harry Ricardo. Upon completion, the new engine was mounted within the same frame used by the 21-cubic inch Model B single-cylinder motorcycle, and by virtue of the engine’s displacement, the new model was simply referred to as the “Forty-Five” or “45.”

Introduced in 1929, nearly 7,000 45-powered Harley-Davidsons were sold. Solo variants remained in production through 1952, while the three-wheeled Servi-Car continued until 1973, finding great acceptance in such cities as New York, Chicago, and Los Angeles. During World War II, Harley-Davidson produced over 88,000 45-powered models. Renowned for their simplicity, reliability, and durability, these machines introduced motorcycling to thousands of servicemen who became loyal customers after the war. Easily tuned and responsive to modifications, 45-powered Harley-Davidsons also dominated flat-track racing during the late-1940s through the early-1950s, solidifying Harley-Davidson’s performance legacy.

By 1947, the 45 was available in the handsome and highly developed WL model, as displayed by the example offered here from the Cars of Dreams Museum. While it is very attractively finished in black with a turquoise and black tank, the restoration on the Harley has mellowed over the years. Nevertheless, the WL is complemented by an abundance of tasteful brightwork and a black leather saddle, and the odometer indicates that it was set back to zero miles during the comprehensive restoration. Please note that this example also features a Kentucky Department of Vehicle Registration assigned tag, number KY 12044, which is properly affixed to the frame.