NOT OPEN TO INTERMEDIATE RIDERS - NO EXCEPTIONS! Refer to regulation 3.4.5 for further information regarding intermediate riders advancing to expert with the intention of running a Formula Open GP machine in this class.

3.18.1 Maximum 85cc single-cylinder liquid-cooled two-stroke, maximum 125cc single cylinder air cooled two stroke, 150cc single-cylinder liquid-cooled four-stroke or 230cc single-cylinder air-cooled four-stroke engines.

3.18.2 Engine modifications are open. Only OEM oversize piston sizes or equivalent permitted

3.18.3 Must use approved D.O.T. tires, race compound tires or slicks.

3.18.4 Must use super sport style frame, modifications are open.