Norton
Model 18 big Four

Norton's existing and well-tried 490cc unit was used as the basis for the firm's first overhead-valve design: the Model 18. Introduced in 1923, it retained its essentially vintage characteristics until 1931 when the range was extensively redesigned, dry-sump lubrication and rear-mounted magneto being standardised. There were numerous improvements made to the engine throughout the 1930s, including enclosure of the valve gear, while Norton's own four-speed foot-change gearbox had replaced the old Sturmey Archer in 1935. Production of an essentially unchanged 1939 model resumed after WW2.

This restored specimen has been put together by two Norton enthousiasts. Parts:

• Big 4 frame from 1954
• Revised ES2 engine from around 1960
• Model 18 fork

Please note that this motorcycle is not yet registered.