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Manufacturers

Associated Motorcycles

1949

£3164.80

348cc

About this motorcycle...

Nicknamed ‘The Boy’s Racer’, the 7R was probably the most successful production racing motor cycle ever to be built in quantity. Based on the pre-war AJS pattern of chain driven overhead camshaft, it remained in production until 1962, and was still giving a good account of itself for many years afterwards.

The first road race outing of the new model was in the 1948 Pau Grand Prix, ridden by Fergus Anderson, and its first win was in the 1948 Leinster 200 (350 class) ridden by Ernie Lyons.

No less than 25 were entered in the 1948 Junior T.T. in which Maurice Cann’s 5th was the best position. Reliability however was so high that 18 of them were finishers. The gilt edged miracle of course was the 4th place gained in the senior race later that week by Geoff Murdoch on his 7R, (much to the disbelief of some of the spectators).

Specification

74 x 81mm = 348cc. chain driven ohc.engine with 8.45 : 1 compression ratio developing 30bhp at 7000rpm on 72 octane fuel. Magnesium alloy crankcase. Light alloy cylinder barrel and head with shrunk in iron liners. Lucas magneto. Amal 10 TT 11⁄8" choke carburetter 43⁄4 gallon fuel tank, Burman 4 speed gearbox.

Duplex cradle frame with swinging arm rear suspension and Teledraulic front forks. Gear ratios 5.14, 5.84, 6,94, and 9.95 to 1. Top gear gives 100mph. at 6,600rpm.