Velocette KSS

The Velocette KSS is a British motorcycle made by Velocette. The final development of the "K" series (the "K" stood for Camshaft (the owners of the company were originally German) and the "SS" for Super Sports) The KSS remained in production in various forms until 1948. 
Development.
A production roadster motorcycle, the KSS was modified with a racing clutch and tuned to achieve 90 mph around the Isle of Man TT course, largely due to the excellent handling. Important improvements included the positive-stop foot-operated gear change from the Velocette KTT production racing version. 
In 1936 Velocette developed the KSS Mk II, which had a Velocette MKV KTT based chassis and a new engine with an alloy cylinder head. A "touring" version, the Velocette KTS was also developed with 19-inch wheels and matching mudguards.
Racing success.
Alec Bennett won the 1926 Junior TT a full ten minutes ahead of the next rider. He had a second place in 1927 and won again in 1928 and 1929.