During the heyday of the racing of classic British single cylinder four-strokes, the 1950's and 1960's, one of the main sponsors of riders was Syd Mularney Motorcycles of Leighton Buzzard. This was one of the bikes that he owned and I suspect, looking at the valve cover on the top of the engine, this may be one of the engines he converted to a four-valve head from the normal two valves of Manx Nortons. Among several well-known riders who rode his machines was Mike Hailwood with considerable success.
These sort of machines, together with the 500cc.models were the bread and butter machines for riders of all abilities in Club, National and World Championship racing through that period and are surely among the most famous racing machines ever produced.
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