Must be nice to race in America its a little harder in the UK
HANDLEBARS, CONTROLS, WHEELS, GEARBOXES, FRAMES, FORKS AND TANKS - should be of original type. Gearboxes restricted to a maximum of 4 gears.
ENGINE - Must be of a make and type originally fitted by the manufacturer, all major components must be of the year in question.
WHEEL RIMS - All machines produced before 1.1.37 must have steel rims. Alloy rims may be fitted to racing machines produced after 1.1.37. Rims must be at least 19" diameter on machines produced before 1.1.37. 18" rims may be used on later machines.
MUDGUARDS - Must be metal and if alloy must be painted to match machine in general. If alloy rear guard, it is advisable to fit strengthening strips on the underside.
SEATS - Duel seats may only be fitted to machines produced after 1.1.45.
CARBURETTOR - Only early 2-piece Amal, TT Amal and track Amal may be fitted. Remote needle (RN) type TT Amal may be fitted from 1.1.37.
IGNITION - Rotating magnet magnetos may not be used unless fitted as original equipment.
REV COUNTERS - Contemporary and Small Electronic Round Analogue types may be used. Digital types may not be used.
HUBS - Must be of a type fitted by the manufacturer with the machine. No dual brakes permitted on solos unless original specification.