2008 Rules
2008 RULES ARE OFFICIAL
2. Roll cage. Roll cages shall be at least 1 inch .062 wall thickness, or 1 1/8 inch .065 wall thickness, or 1 1/4inch .065 wall thickness. Roll cage shall be made of chromoly steel or equivalent material. The front section of the cage shall be no further back than the steering wheel. Roll cage shall have sufficient fore and aft bracing and strength to support the weight of the car & driver in case of an upset. Cage shall have gussets at the intersecting bars to the uprights. Bends must have at least 3 inch radius. No square or pointed corners allowed. Roll cage must be a minimum of 3 inches above the driver’s helmet. It is mandatory to install a cross brace behind the seat to support the shoulder harness.
3. Electrics and Electronics. On and off switches must be on dash, top of the cowl or on steering wheel. On/off switch must be connected and functional. No radio communication is allowed with the car or the driver. During Heats and Feature races Other than communication device with Raceceiver offical.
4. Fuel. Class "A" 600cc powered cars may run methanol or gasoline.
5. Weight. 4 cylinder 600cc powered cars, minimum car and driver weight 750 lbs.
6. Suspension. Tread; Maximum 50 inches. Minimum 32 inches, center to center of tires. Wheelbase; Maximum 70 inches. Minimum 50 inches, center of front axle to center of rear axle. Steering; Front wheels must be connected by a solid or tubular tie rod. Rear wheel drive only. All suspension bolts except wheel nuts must be secured by some type of locking device.
7. Shocks. Any shock absorber legal, except no cockpit adjustable shocks on multi cylinder cars.
8. Tires And Wheels. All cars; Any wheel size and tire combination may be used, but tires may not exceed 221/2 inches in height. Wheels must be held on with 4 or more standard lug nuts or knock-off hubs. 4 cylinder 600cc cars only; Right rear tire must be a minimum 50 durometer compound or harder Hoosier or AmericanRacer (McCreary) tire. Tires may be grooved or siped. Tire durometer check should be done at least 5 minutes after the races to allow for cool down.
9. Bodies. All cars must have complete bodies. Tail sections must be in place for time trials and all races. There must be a metal firewall between driver and engine, made of 24 gauge steel or .0625" aluminum. Body of car must be made of aluminum, metal, fiberglass or high impact plastic. All cars must be painted an attractive color or colors. No rear view mirrors. The only part of the car allowed to be dismantled for driver to enter or exit is a quick release steering wheel hub. The minimum opening on the right side of the car will be 14 inches from the top of the roll cage to the top of the mud guard or sissy bar and 16” minimum from the front down tube to the back. No mechanical, electrical or hydraulic adjustments will be allowed in the cockpit area on multi-cylinder cars. If you chose to have an inside pan hard adjuster it must be bolted to where it cannot be moved during a race by the driver. All fuel tanks must be equipped with a one-way check valve designed to prevent the spillage of fuel from the fuel tank vent in the event of a rollover.
10. Transmission. Four cylinder motors must have transmission with all stock gears in working order. Any car equipped with a shifting mechanism must have this device mounted in the driver’s compartment. Shift levers may mount outside the driver’s compartment on opposite side of car from the chain drive. Chain guards will be made of .090 inch thick aluminum or equivalent and will run on top of chain from the front of the front sprocket to the center of the rear axle. Driver must not be able to touch the chain or sprockets while sitting in the cockpit.
11. Wings. 12 square ft maximum, 10 square foot maximum on special shows may be designiated upon prior notice. Wicker Bill 3 Inches max. Right side board, maximum 48" x 18". Left side board, 48" x 24". The wing cannot be mounted outside the tires. Side boards may not extend more than 3" beyond center section and sides must cover center section Wings must be mounted parallel with cage and no offset side boards. All wings must have 1/16" radius edges or edging. No raw edges. No wood except for ribs or spars inside center section. Nose wings cannot exceed 18"x 24", and must carry car number. Top wings are mandatory to enter a night's event. Cars may finish without a wing if no replacement is available. No Manual and or electric wing sliders allowed in cars, device may be present but must be securely locked out with bolt and or minimum of 3 plastic tie straps.
10 SQUARE SPECIAL SHOW WING REGUIRMENTS
12. Engine Rules.
4 cycle single cylinder engines larger than 250cc, but not exceeding 600cc.
NO modification allowed.
Stock engines as the motor was run on the motorcycle with the charging unit.
Valve jobs will be allowed as long as they are in manufacturers tolerances.
Stock valves must be retained.
No engine work (no ported heads, no lightened cranks, no cam de-greeing, no lightened pistons, and no head cleanup.)
Stock pistons only. Stock Rods, Wrist Pins, and OEM RINGS,
Stock no Twisted Cams
Stock Rocker arms and Lifters,
Any air cleaner will be allowed.
Any exhaust will be allowed. Crank case ventilation to atmospheric pressure only allowed. Rods, pistons, cams etc. must be stock parts as used on the engine in which it came from.
Any STOCK OEM Carb will be allowed No flat slide carbs.
Carbs may have metering rods, jets and springs changed to tune the fuel curve to match our cars requirements. Any stock appearing black box with “out” external1adjustments must be same engine make. Aftermarket timing advancers are illegal. Cam gears that are redrilled ,slotted or altered are illegal. Internal charging systems components must remain in the motor. Fuel injected motor except current year production completely stock as it came off the bike with pan modification, oil pick up modification, any air box, stock appearing CDI stock, aftermarket washable replacement air filter and power commander POWERCOMMANDER MAY ONLY UTILIZE THE FUEL ONLY MODULE. NO MAPPING FOR IGNITION. FI Motors may run gasoline or Alcohol. Any sprocket (520 or 530) will be allowed. No current year production engines as specified by manufacture.