Machine Requirements

1. From a distance of 10 paces, machines must be of an overall appearance that accords with the period and all cycle parts must perform the function they were originally designed for.
2. External engine parts must conform to a design & specification readily available from the manufacturer to private buyers up to the end of 1963. (In the case of Manx Nortons, this is to 31st December 1962 and by special exception 250cc/350cc 'long stroke' wet clutch Aermacchi's to 1964). In particular, all external castings must look original and be of the original type of material and dimensions although magnesium may be substituted for aluminium.
3. Pre 1963 specials (eg the McIntyre Matchless and works machines) must be of European origin and be substantially the original machine (i.e. not a replica). Proof of provenance is on the rider
4. Replicas of 3. may (at the discretion of the organisers) be permitted to race if the original is not racing in the series and the bore & stroke does not infringe 12. below. This concession is with the particular intention of allowing machines to race of notable technical merit e.g. an Earles fork Manx Norton.
5. No fairings (either full or half) although flyscreens are permitted (if ACU legal).
6. Pre '63 original fitment drum brakes only. On the front wheel there must be no more than 2 leading shoes on either side.
7. No carbon fibre or titanium parts.
8. Exhaust pipes: Low Level (where used) must follow the original route which for most Lansdowne machines (eg: Manxes, G50’s, 7R’s) will be from the cylinder head, across the timing chest and exiting under the rider’s off-side footrest; low pipes must also be of a constant diameter from the cylinder head to the mid-point of the gearbox. High Level pipes (where used) must accord with ACU requirements. Stepped or tapered High Level pipes are permitted but will be handicapped accordingly.
9. Unless the Regulations state otherwise, the ACU noise limit of 105Db applies to all Lansdowne races. There must be no changes to the silencing system after passing a noise test such that the machine is then used on the track outside the permitted limit. Contravention of this will as a minimum result in a zeroing of all championship points in relation to that meeting.

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