1953 AJS 349cc 7R Racing Motorcycle
Engine no. 53/7R 910
Built from 1948 to 1963, Associated Motor Cycles AJS 7R - known as the Boy Racer - was one of the most successful over-the-counter racing motorcycles of all time. Almost all of Britains road-race stars of the 1950s and 1960s rode a 7R at some stage of their careers, and the model remains a major force in classic racing today, being highly sought after by competitors and collectors alike. Although a new design by Phil Walker, the 7R, with its chain-driven overhead-camshaft, was very reminiscent of the AJS cammy singles of pre-war days. Despite the fact that the 7R was not, initially, as powerful as its main rivals - the Velocette KTT and Junior Manx Norton its robust and simple construction endeared the model to the privateer responsible for his own maintenance. While the duplex loop frame and Teledraulic front fork remained essentially unchanged throughout production, the engine underwent almost continuous revision: the valve angle being progressively narrowed, the crankshaft made stronger and, in 1956, engine dimensions changed from the original long-stroke 74x81mm bore/stroke to the squarer 75.5x78mm, permitting higher revs. AMCs own gearbox replaced the previous Burman in 1958 while engine development continued almost to the end of production, by which time the 7R was putting out around 41bhp. This example was purchased by Professor Ehn in the UK in 1994 and test-ridden only once before being placed in the Museum. There are no documents with this Lot.
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