Norton revised
the 490cc 16H engine for 1931, establishing
the form that would remain until the end of
production nearly three decades later. The magneto
was moved from the "vintage" forward
mounted position to behind the cylinder and
the lubrication became dry sump. These revisions
were followed in 1935 by the adoption of the
Norton 4 speed foot operated gearbox. More Norton
16H information.
