Ultralightweight, Lightweight and Heavyweight Supervintage (Period Il)

Period II Ultralightweight class is limited to approved air cooled machines made after 1968, like the Honda MT air cooled and the Yamaha series TA, TD also limited to 200.   Period II Lightweight and Heavyweight Supervintage classes are limited to thoroughbred grand prix motorcycles, and race-prepared roadster motorcycles of comparable performance and appearance, with a maximum model year of 1972, maximum displacement of 850cc, two- or four-stroke, with the following exceptions permitted regardless of model year:

  • BSA factory team machines (and replicas) used to 1972,  650cc twins
  • Ducati bevel drive singes and twins
  • Harley-Davidson KR750 and XR750
  • Honda MT 125 (air cooled)
  • Modified Honda CB/CL/SL 350 and 360
  • Honda CB/CL 450, CB/CR750
  • Kawasaki H1R, H2R and replicas
  • Laverda SFC and replicas
  • Moto Guzzi to 1980
  • Norton Commando
  • Suzuki TR500, T500, TR750
  • Triumph factory team machines (and replicas) used to 1972,  650cc twins
  • Yamaha TD-1A, B, C.  TA125
  • Yamaha TA250, TD2, TD2B, TR2, TR2B, TD3, TR3, RD250,  (air-cooled only, race trim), XS650
NOTE: above "excepted" machines are still subject to general Supervintage rules set forth below, irrespective of original equipment.

Classes based upon specification and displacement:

  • Ultralightweight Supervintage: 
    • Up to 200cc-single or twin 2-stroke air-cooled engine from approved list
  • Lightweight Supervintage:
    • Up to 250cc-twin cylinder 2-stroke
    • Up to 360cc single cylinder 2-stroke
    • Up to 360cc single cylinder 4-stroke
    • Up to 360cc-twin cylinder 4-stroke
    • Up to 350cc four cylinder 4-stroke
  • Heavyweight Supervintage:
    • All other Period II Supervintage legal machines, 850cc maximum displacement.
Maximum displacements above do not include permissible overbores of 5% over class limit

Rules applicable to Periods II Supervintage Classes:
i. Engine: No pressurized induction. Internal updating permissible; external appearance should remain same.
ii. Gearbox: Internal updating permissible; external appearance should remain same.
iii. Wheels: Wire-spoked wheels, minimum 17 inch diameter, maximum width 2.5 inches (WM-4) front, 3.0 inches (WM-5) rear.
iv. Tires: maximum width of 140mm (as stamped by manufacturer on tire). Treaded tires only: no slicks, or slicks treaded after manufacture.
v     Brakes: period type and make required; discs allowed - period calipers ONLY.
vi. Maximum fork tube diameter 38mm unless machine originally equipped ex-factory with larger units.
vii. Swingarms must be 2-sided, of period design and materials, and have a shock absorber located on each side without secondary linkage (OEM excepted; e.g., Vincent and NSU).
viii. Bodywork must be of a design and appearance actually used in the applicable period.
vii. Carburetors: Round slide or Sand cast "tickler" type CR carburetors in Period II

Table of Contents (click on any item to view that page)
Names and Addresses
Class Overview
Bumping
Rule Changes
Championship Points
General Rules
Early Vintage & Pre '65
Screaming 50's
Grand Prix (Period I)
Supervintage (Period II)
Middleweight (Period III)
Period IV
Formula RD
Formula CB350
Sidecars
American Twins

Last Updated: 2/25/06