Tim,
Please can you tell me where you found this supplementary information?
Thanks
Dave
Here is my copy (I dont know why this is in Non Vincent related I cant think of anything more Vincent related than prevention of them being raced
)
Supplementary Regulations: VMCC Ltd: British Historic Racing.
Machine Specification for the ACU Solo Girder Fork Championship.
GENERAL.
Subject and subordinate to ACU Standing Regulations for Road Racing. Every machine must comply in every way to the ACU Standing Regulations and Specifications. All the class will be open to Motor Cycles of any country of manufacture and to the particular specification below and as per BHR specification.
IN PARTICULAR NOTE:
1. All major engine, gearbox and frame components must be of a type manufactured in the period of production of Girder Fork motorcycles. Replica parts may be used.
2. It is impossible to lay down hard and fast rules as to what can and cannot be altered, replaced or re-designed and still harder to enforce them, but it is hoped that members and others preparing racing machines will interpret the following in the right spirit.
3. The object of the Machine Specification is to try and preserve machines used for Vintage speed events so that they appear, as far as possible, as per their original specification - "In order that a new generation can marvel".
4. Parts, especially internal engine parts have to be replaced from time to time and it is obvious that adaptations have to be made and non0standard items fitted, but external components should be in keeping with the rest of the machine and consistent with safety.
5. There may be isolated cases where the original specification appears contrary to the Machine Specification, i.e. there was a magneto in the vintage period with rotating magnets. Obviously, these are "exceptions to prove the rule".
RULES APPLYING TO THE CLASS:
STREAMLINING:- No streamlining allowed.
FORKS:- Only Girder Forks allowed, no Girdraulic or other forms of hydraulic forks allowed.
CAPACITY:- Machines may be bored to a maximum of .060" over the standard bore. If the bore is further increased and/ or the stroke is increased then the machine will be deemed to be in the next class as far as championship points are awarded. The bore and stroke of the engine must be clearly stamped on the crankcase or stamped on a metal plate and securely fixed to the crankcase.
TYRES:- Tyres must conform to the current ACU Regulations, be in a serviceable condition and be of such width as can be fitted without modification to the frame ad forks.
WHEELS:- Must be a size as available to the machine at the time of manufacture. Pre 1935 machines will have steel rims. Some post 1935 machines fitted alloy rims, these will be allowed.
FUEL:- Any commercially available pump fuel (unleaded, Leaded, super unleaded or lead replacement up to Avgas 100LL specification or Diesel may be used. Methanol may be used in any class of machine. An orange day-glow disc (minimum 3" diameter) must be affixed on or immediately adjacent to the Racing Number on both sides of the machine using methanol.
FRAME AND FORKS:- modifications to engine plated and strengthening allowed.
TANK:- Steel, copper or brass and quick release fixings allowed.
MUDGUARDS:- Must be metal and if alloy must be painted to match the machine in general. If alloy rear guard it is advisable to fit strengthening strips on the underside.
HANDLEBARS:- One piece handlebars, not "Ace Type", clipped to the steering head yoke, not direct to forks.
HUBS:- Must be of a type fitted by the manufacture with the machine.
ENGINE:- All main castings to be of a design and of a material in use at the time of manufacture. External modifications which materially alter the original appearance will not be permitted - e.g. extra fining on barrel/ head, repositioning magneto and drive, alteration to induction layout as in conversion to down draught.
EXHAUST SYSTEM:- The exhaust system must comply with ACU regulations and noise controls and be in keeping with the period appearance of the machine.
CARBURETTOR:- Genuine carburettors of any make or type, plus standard needle-type Amal (type M, 6 etc, pre Monobloc). Track type27 carburettors may be used. Remote needle (RN) TT Amal may be fitted from 1.1.37.
MAGNETO:- Any magneto except rotating magnet type, unless the rotating magnet was fitted as a standard fitting to the original machine.
ELIGIBILITY:- All machines must be registered with BHR and have a ELIGIBILITY CERTIFICATE.
THE CHAMPIONSHIP POINTS SYSTEM.
Points will be awarded to the first ten finishers in each round of the championship.
For machines 501cc and over the points will descending from 15 to 1 as follows
15 12 10 8 6 5 4 3 2 and 1
For machines 351cc to 500cc the points will descending from 17 to 2 as follows
17 15 12 10 8 6 5 4 3 and 2
For machines up to 350cc the points will descending from 19 to 3 as follows
19 17 15 12 10 8 6 5 4 and 3
At the end of the season should two riders finish in first place the one with most wins throughout the season will be champion.