AHRMA (American Historic Racing Motorcycle Association) announces that the 2nd Annual AHRMA Vintage Cup has been moved to the 2021 season. This change has been made due to the unpredictable nature of the 2020 racing season. The 2021 AHRMA Vintage Cup, sponsored by NYC Norton (nycnorton.com) and Roadracing World (roadracingworld.com) will feature the 500 Premier class as originally planned for the 2020 racing season.
AHRMA expects to hold much of the 2020 season’s road race events as scheduled from mid-summer through the season finale at the 2020 Barber Vintage Festival in October.
For eligible machines and rules specific to the 500 Premier class, please see below. You may also refer to the 2020 AHRMA Handbook, which can be found online at www.ahrma.org/ahrma-handbook.
500 PREMIER: Any fully GP-kitted 500cc OHV/OHC or 750cc sidevalve four-strokes built before December 31, 1968, and like design. Among the eligible machines are:
Benelli, “works” fours
Bianchi 500 “works” twin
BSA 500cc twin or single “works” or replica, up to B50
Dick Mann frame with G50 or other period engine
Ducati 450 single
Ducati 500cc bevel-gear V-twin “works” racer and accurate replicas
ESO 500 single
Harley-Davidson KR roadracer
Honda CR450 roadracer
Honda RC181 4-cylinder (no replicas)
Jawa “works” twin
Jawa 500 single
McIntyre Special and replica, G50 powered
Moto Guzzi single, twin and V8
MV four, early wide-angle head (pre-1973 era)
Norton Dominator Daytona 500 or replica
Paton twin (8-valve Paton twin not legal for 500 Premier)
Rickman GP roadracing frame, powered by G50 or other period engine
Royal Enfield, including India-built models.
Seeley frame with G50 or other period engine
Triumph 500cc twin “works” or replica; Weslake four-valve heads permitted
Velocette Thruxton and Venom Clubman
Vincent Grey Flash or replica
Weslake (Nourish) pre-unit engines
Note: Honda CB/CL/SL 350 twins are not eligible for this class. See 350 Sportsman or Formula 250.
10.2.6 REQUIREMENTS AND MODIFICATIONS FOR GRAND PRIX CLASSES
All GP-class motorcycles must be fully GP-kitted, with no lights, no starting mechanisms, no street equipment or associated brackets (factory-welded brackets may be retained if desired), low narrow handlebars (maximum width 32 inches). Fairings are encouraged.
Frame may be changed to racing type, though must be period type and style. (See rule 9.7.3)
Front forks may be changed, though must be period type and style. “Ceriani-type” may be no larger in diameter than 35mm, unless supplied as OEM on that motorcycle.
Period retrofit gearboxes are permitted (e.g., Quaife, Schafleitner). Maximum six speeds unless otherwise stated.
Front disc brakes are prohibited. Rear disc brakes are permitted, but must be period equipment.
Magnesium engine cases are allowed in 500 Premier.
The number of valves in the cylinder head may not be increased or decreased from stock.
No more than one carburetor per cylinder. Gardner carburetors are permitted.
All modifications must be consistent with the spirit of the class and period.
Appearance and workmanship of a reasonable standard shall be enforced.
Two-strokes must use silencers.
Maximum rim width is WM3 (2.15 inches) in all GP classes
Note: See requirements of all road racing motorcycles in Section 9. Get those bikes out and ready to race in 2021!