Norton CS1

The Norton CS1, short for Camshaft Senior Model 1, was a Norton motorcycle built between 1927 and 1939. It began as a Tourist Trophy racer and was Norton's first design with an overhead camshaft engine, drawn up by Walter Moore in 1927 from the pushrod ES2 engine and reusing many of its parts, with a bevel-driven shaft to the cam, a new full cradle frame and a close-ratio gearbox. After the early 1930s redesign by Arthur Carroll it became an upmarket road bike, sold alongside the smaller 350 cc CJ. Alec Bennett won the Isle of Man Senior TT on it in 1927, and in 1931 Norton CS1 machines took the first five places in the Junior and Senior races, the start of Norton's most successful period. Many touring models were later upgraded with racing parts.