Must be stock-type engine designed and manufactured for production motorcycle use. Single engine only. Carburetors, turbochargers, fuel injectors and superchargers may be used in any combination. Unlimited displacement. Crankcase and all tanks containing fluids must have vent tubes routed to a catch can or have a non-spill breather system.

Must have front and rear guards to cover the width and at least the top run to the centre line of the sprocket of any chain or belts. Chain guard to be made of .060 inch steel or .125 inch aluminum and be securely mounted at a minimum of two points or O.E.M. No clamps or tie straps. Rear mounting point to be no more than six inches in front of rear axle.

Must have at least half of the side surface covered by .060 inch steel or .125 inch aluminum unless stock equipped. Guard must be securely mounted in a safe craftsman-like manner.

Front and rear hydraulic type brakes are mandatory. Minimum rotor size is 7 inch diameter x 3/16 inch thickness, O.E.M. or aftermarket. Rotors may be drilled only if minimum diameter and thickness are maintained.

Handlebars must measure 20 inches overall with grips removed. Grips may not extend below bottom of fork crown. Snap back throttle return mandatory. Foot pegs may be rear set. Any shifter or brake pedal that can be operated with the foot on the peg will be permitted. Air shifters permitted. Air bottles must be stamped with Dot-1800 rating and be securely mounted. No hose clamps or tie straps.

Front suspension must have minimum travel of 2 inches. Front forks must be a minimum of 32 mm or stock. Steering dampener recommended. Rear suspension not recommended.

Stock or aftermarket frames are permitted. Must be mig or tig welded. If replacement parts are 4130 chrome moly; must be mig or tig welded. Steering head angle to be not less than stock rake. Swing arm or frame may be used as an air tank. Pressure not to exceed 150 P.S.I. Some method of checking pressure is mandatory.

70 inches minimum length recommended.

Front wheel: minimum diameter 16 inches; maximum diameter 19 inches. Rear wheel: minimum diameter 14 inches; maximum diameter 18 inches.

No body parts are necessary. Rear fender must cover the full width of the rear tire and extend behind the rear axle and forward below seat position. Seat, tail section and rear fender may be incorporated into one unit.

Permitted. Must be mounted securely.

Any ignition system is permitted. Must be equipped with a positive ignition cut-off attached to the rider with a lanyard of rawhide, wire, etc. Cut-off must be connected on primary side of the ignition circuit.

Must be self starter or external electric starter; roller or push starts prohibited. Battery covers required for starter cart/vehicle.

Full leathers are required if running 120 m.p.h. or faster. Two piece suits (jacket and pants) must be joined with a zipper at the waist. Must have leather boots/shoes which cover above the ankle.

For racers running less than 120 m.p.h., a leather jacket is mandatory. Must have leather boots/shoes which cover above the ankle, and leather gloves.

In all circumstances the protective clothing must be in good condition.