The American Motorcycle Association (AMA) class C rules of 1952 allowed sidevalves of 750cc to compete against 500cc overhead valve bikes. The K series was replaced by the overhead valve Sportster series in the retail market in 1957. From 1954 to 1956, the KH received an increase in stroke to 4-9/16" to bring displacement to 888cc (54 cubic inches). The K models featured a 750cc unit construction engine and transmission case, right side foot shift and left side foot brake. In 1952, the K series flatheads was introduced with the same bore and stroke, selling in parallel with the W series (which was discontinued after 1952), designed to compete with British sporting motorcycles of the time. The engine continued virtually unchanged with 2.745" bore and 3.8125" stroke with various G-based designations in the three-wheeled Servi-Car until production ceased in 1973. and Canadian Army's WLC (C = Canada) primary two-wheeled mount and subsequently as a civilian middleweight through 1952. The WLA (W = return oil, L = performance, A = army) went on to serve in World War II as the U.S. The D and R models featured a total-loss oiling system and were succeeded in 1937 by the (primary VIN letter) W 45, which had recirculating oil lubrication. market, the 45-cubic-inch (740 cc) (primary VIN letter) D model (1929 to 1931) and its technical descendant, the (primary VIN letter) R model (1932 to 1936), started Harley's side-valve tradition in the 45-cubic-inch displacement class. The flathead engine saw service in Harley-Davidson motorcycles beginning with the Model WS flat-twin, produced from 1919 to 1923, and continuing in 1924 with single-cylinder export-model 21-cubic-inch (340 cc) and 30.5-cubic-inch (500 cc) singles and continued in Servi-Cars until 1973. BMW R12 Model W, singles, and 45s (DL, RL, and WL)
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