Chapter 10 – Grand Prix (GP) And Formula Rules
Grand Prix class machines include any manufacturer’s purpose built racing machines available to a factory rider or privateer and such machines must conform to the regulations in Chapters 4 and 5. The rules of this section are intended to be a guide for the safe modification of “production” machinery and are not intended to disqualify any OEM GP machines.
10.1 Motorcycles used in competition are two wheeled vehicles, which receive power transmission to the rear wheel from one motorcycle engine, the power to be delivered to one wheel only.
10.2 There must be no streamlining other than a seat or tail section behind the line drawn vertically through the axle of the rear wheel. The rim must be visible for the 180 degrees of its circumference to the rear of such a line.
10.3 If a streamlined tail section is used, it cannot be wider than thirteen (13) inches.
10.4 No part of the seat, or anything to the rear of it shall be more than 35 1/2 inches above the ground when the motorcycle is not loaded.
10.5 It must be possible for a motorcycle not loaded to be inclined to an angle of 50 degrees from the horizontal without any part of it, other than the tire, coming in contact with the ground.
10.6 The fairing must have a minimum of three separate mounting points.
10.7 Any crankshaft configuration may be used, i.e. 180 degree firing, alternative firing, etc.
10.8 Superchargers or turbochargers are prohibited.
10.9 Fuel injection is permitted.
10.10 Race fuels are allowed. Engine fuel must consist of gasoline, defined as a petroleum fuel. Additives for lubrication, knock suppression, or octane improvement are permitted. Use of anything other than a petroleum fuel is prohibited.
10.11 A transmission (gear box) is limited to a maximum of six speeds.
10.12 Ventilation of brakes is permitted.
10.13 Wheel rims smaller than 16 inches in diameter are prohibited.
10.14 Aluminum or titanium wheel axles are allowed.
10.15 Titanium frames are prohibited.
10.17 The gas tank must have a minimum capacity of 5 litres and a maximum capacity of 24 litres. It must be of metal construction.
10.18 Seat tanks are prohibited.
10.19 Gas tank vent lines must have a device that prevents the escape of gasoline.
10.20 A rear chain guard is not required.
10 21The exhaust system must be securely assembled and securely attached to the frame.
10.22 The discharge end of the exhaust system may not extend beyond the rear edge of the rear tire, and may not point in a direction that creates dust or interferes with the vision of other riders.
10.23 Re-capped or re-treaded tires are prohibited.
* Note: All fabrication and modifications must be done in a safe and workmanlike manner, and all machines are subject to inspection.