These are the eligibility rules which apply to the 500cc aircooled class run by the UK CRMC. Perhaps we might do something similar but include Periods 3 and 4, and exclude two strokes ? ?
PART 10 - POST CLASSIC AIR COOLED CLASS The purpose of these regulations is to allow machines with production / road bike engines up to 500cc in road or race based frames to race in the Post Classic Air Cooled Class Period: 1/1/73 to 31/12/1981 Group: Clubman Capacity: Up to 500cc – air cooled engines ONLY Regulations: Clubman 1 Post Classic rules apply to these machines with exceptions / additions listed below 1. Machines: There should be some racing history to the type of frame and engine combination being proposed. Both original and faithful replicas of such machines are allowed. 2. General Requirements: 2.1 Frames: Mono-shock frames are permitted providing evidence is provided that they were raced in period (known examples are frames by Foale, Kerby, Maxton and Spondon; this is not an exhaustive list and other frames will require proof of period use). Frames must be of steel construction. 2.2 Engines: Two stroke or four stroke up to 500cc. Machines with engines originally listed at 500cc are allowed to overbore to +1.5mm maximum. Single, twin, triple or four cylinder production / road bike air cooled engines only. No dry clutches except where proof can be provided that such a machine was raced with a dry clutch in period 2.3 Carburettors: No flat slide carburettors 2.4 Brakes: Only single or twin-piston brakes. Remote master cylinders not allowed. 2.5 Wheels: As per Clubman Post Classic 1 so with minimum wheel diameter = 18" 2.6 Tyres: The maximum width for front tyres is 110mm and for rear tyres is 130mm 2.7 Forks: Maximum diameter 38mm
Why exclude 2 strokes? And if air-cooled, allow methanol fuel. There's a heap of air cooled bikes around that are not being raced in P5 even though, in the era (P5) up to '78, they were competitive on methanol.
“Racing is life. Anything before or after is just waiting.” Steve McQueen
Aircooled 500cc race class
| Join the Forum to Rate this Topic at: 
Posted - 29 Dec 2012 : 08:20:56 AM
