Walter Moore's cammy engine drove through a Sturmey-Archer three-speed gearbox, a saddle tank appeared on the new machines for the first time, and a cradle frame with Webb works achieved superior road-holding. Braking was also enhanced with Royal-Enfield 8" hubs front and rear.
Production machines appeared later that year, and were first marketed in 1928 with a top speed of 85 mph.
Moore was enticed away by NSU and a German version of his OHC engine soon appeared on their machines. The CS1 remained in production until late 1929 when a new version was released.
Courtesy New Zealand Classic Motorcycles