All major components must be of British manufacture as supplied and catalogued. Namely: front forks, yokes, hubs, engine, gearbox, carburettor (up to and including Amal Mk4 concentric), frame, swinging arm of a type used before 1970 as original manufacturers specification, with a substantially unmodified front frame diamond.
Ignition systems to be of a type available to the Clubman, Pre-1970. They should be one of the following four types:
TWO STROKE CLASS
Ceriani forks will be allowed when fitted to the appropriate Greeves as catalogued when leaving the factory.
MOTORCYCLES AND SIDECARS
Engines and frames must be of British manufacture; all other major components must be of British or European origin.
Any British manufactured machine which does not, in the eyes of the Committee conform to these Regulations will be allowed to be ridden on a strictly “No Award” basis.