Scarcat said:
ok ... here are the classes
SUMMARY OF THE VINTAGE RACING CLASSES
1. PRE-50: Motorcycles manufactured before December 31, 1949.
2. PRE-65: Motorcycles of a maximum model year 1964.
There are two displacement classes: 350cc and 500 cc.
3. PERIOD ONE CLASSIC VINTAGE: Maximum model year 1967. Any machine originally
manufactured for roadracing, or a machine subsequently modified for roadracing.
There are five classes: 200, 250, 350, 500 and Open
4. PERIOD TWO SUPERVINTAGE: Maximum model year 1972. Any machine originally
manufactured for roadracing or a machine subsequently modified for roadracing.
There are two classes: Lightweight and Heavyweight
5. MIDDLEWEIGHT PRODUCTION: Maximum model year 1976. Any machine originally sold for
street use and subsequently modified for road racing.
6. PERIOD THREE: Maximum model year 1982. Any machine originally manufactured for
roadracing or a machine subsequently modified for roadracing.
There are three classes: Lightweight, Middleweight and Heavyweight.
7. PERIOD FOUR: Maximum model year 1989. Any machine originally manufactured for roadracing
or a machine subsequently modified for roadracing.
There are three classes: F3, F2 and F1.
SIDECAR: There are three classes for outfits built before the cut-off dates or constructed after such
dates and are consistent in design and construction with outfits actually built in that period:
10. P1 Classic for outfits built before 1968
P2 Supervintage for outfits built before 1973
11. P3 for outfits built up to and including 1982
Very interesting... here is a ruling on the CB350 bikes:
HONDA CB/CL/SL/350 twin cylinder machines, in order to be eligible for Period 1 GP, are limited to
stock original equipment engine internal and external parts as originally fitted to these models. No parts
designed for another model of Honda or any other motorcycle may be used. No aftermarket
components are allowed except for valve springs. Carburetors cannot be greater than 30mm choke size
and may be any Period 1 legal model, round slide Keihin or Mikuni.. Ignition systems may be after
market and/or electronic. NO MODIFICATIONS WHATSOEVER by any machining or chemical
process may be made to the engine, intake tract, carburetors, or any other engine component. The only
modifications allowed are the removal of the electric starter, alternator components and the fitting of a
racing style exhaust. The rolling chassis must be of a racing style as per Period 1 rules.
Correspondingly, modified Honda CB/CL/SL 350 twin cylinder machines, which deviate from the use
of stock original equipment engine components, are moved to the Period 2 Supervintage Lightweight
class.