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W. S. Harley's patented compression release system. [4] Note the screw caps in the cylinder heads giving access to the valves. 1922 Harley-Davidson WJ Harley-Davidson's intention in introducing a new middleweight model was to increase the size of the motorcycle market by appealing to new riders with an entry-level product. [5]
V-twins may be mounted either longitudinally with the cylinders protruding either side, like the Honda CX500 and Moto Guzzi, or transversely, such as Harley-Davidson, Ducati, or Aprilia. [13] Transverse V-twins can raise difficulties in cooling the aft cylinder, and in siting the airbox, battery, aft carburetor, and aft exhaust pipe. Flat-twin
In 1921, Otto Walker set a record on a Harley-Davidson as the first motorcycle to win a race at an average speed greater than 100 mph (160 km/h). [28] [29] Harley-Davidson put several improvements in place during the 1920s, such as a new 74 cubic inch (1,212.6 cc) V-Twin introduced in 1921, and the "teardrop" gas tank in 1925.
The Tri Glide is based on the Harley-Davidson Electra Glide Ultra Classic, a conventional two-wheeled touring motorcycle. [1] Harley-Davidson entered into an agreement in 2008 with Lehman Trikes of Spearfish, South Dakota to provide parts and "conversion services", [ 2 ] and final assembly of the Tri Glides was initially completed at Lehman's ...
The Harley-Davidson RL 45 is a model of the R-series range produced from 1932 to 1936, preceded by the DL range (1929–1931), which was Harley-Davidson's first 45 cubic-inch and first flathead V-twin motorcycle, and succeeded in 1937 by the WL. The R-series range included 45-solo, R, RL and RLD models.
Harley-Davidson used IOE engines with atmospheric inlet valves until 1912, [12] and with mechanically driven inlet valves from 1911 to 1929. [13] Indian used IOE valvetrains on all of their four-cylinder bikes except those built in 1936 and 1937. [14] [15] Other American motorcycle manufacturers that used IOE engines included Excelsior ...