RULES & REGULATIONS
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S.P. CLASS
[STREET PRO]
Designation: “SP” followed by bike number.Reserved for Sportster, Buell, Big Twin, Harley-Davidson V-Rod and aftermarket based motorcycles. Motorcycle must be ridden under it's own power to staging, starting line and back to the pit area after completion of the run (no towing allowed except for verified breakage after the conclusion of a run).
Requirements and Specifications
Minimum weight at conclusion of run, including rider and safety gear, must be 5.50 lbs. per cubic inch for all air-cooled, push rod engines and 6.80 pounds per cubic inch for V-Rod engines.
- ENGINE
Engine: Must be Harley-Davidson based 45 degree, air cooled XL, FX, aftermarket V-Twin or Harley-Davidson V-Rod 60 degree water cooled V-Twin. Maximum displacement is 140 cu.i.. All engines must be naturally aspirated and all air must be delivered to the engine through a carburetor(s) or through a single fuel injection throttle body. Closed loop EFI control systems are allowed. EFI unit must be submitted to AHDRA for approval. Air induction is limited to concentric, continuous reducing diameter velocity stack(s) with a maximum opening area of 20 square inches each. No cups or scoops are allowed. Any other engine internal modifications are legal. No Finless Cylinders. Aftermarket heads are legal. Lateral valve stem angle must be zero degrees and minimum longitudinal valve stem angle is 18 degrees as measured parallel from a vertical line centered in the respective cylinder bore. Crankcase vent tube must be routed to catch can or carburetor air intake system.
Fuel: VP Racing Fuels C-25 is the specified fuel. No Fuel additives and /or combustible oil additives are allowed. Dielectric constant, as per AHDRA testing meter, must match baseline reading of specified fuel. Fuel must match color of specified fuel. Fuel must match AHDRA generated graphs in random Gas Chromatography analysis of specified fuel.
- DRIVE TRAIN
Chain Guard: Must have chain or belt guard for primary and secondary drives.
Transmission: Must be based transmission, modifications are legal. Must have based clutch, any modifications are legal. Belt drives are legal. Rear wheel drives may consist of any ratios and materials. Manually operated air shifters or electric engine kills are allowed. No automatic transmissions. No slipper clutches allowed.
- SUSPENSION AND BRAKES
Brakes: Front and rear mandatory (disc or drum).
Controls: Handlebar controls must be located in safe, workable position. Foot pegs and foot controls shall be located within the perimeter of the frame cradle. All controls must meet or exceed OEM equipment standards. Snap-back throttle return mandatory.
Suspension: Front suspension minimum size 30 mm and minimum travel of 2 inches. Rear suspension not necessary. Struts allowed.
- FRAME
Frame: Stock Harley-Davidson OEM frame or after market frame of which at least 25 of the same design have been manufactured and are available to the general public. Backbone may be raised to accept taller cylinders. Rake may be altered 3 degrees only. Swing arm may be altered or changed. No specialized race frames. A frame-mounted kickstand is required.
Ground Clearance: Minimum of 2 inches with rider on motorcycle and 10 p.s.i. in rear tire (includes exhaust and kickstand).
Wheel Base: 70 inches maximum (measure center to center, front and rear axle), including chain adjustment.
Wheelie Bars: Are not allowed.
- WHEELS AND TIRES
Tires: Must be V rated/D.O.T. motorcycle tire. No car tires allowed. Must have 2/32 tread on front and rear. Any size. The tread radius of the tire, as viewed in cross section, shall not be more than 12".
Wheels: Stock OEM wheels or aftermarket performance wheels. Any size.
- BODY
Body: Stock OEM front and rear fenders and gas tank, or custom fenders and gas tanks are allowed. Rear fender must cover the width of the rear tire and extend beyond the vertical centerline of the rear axle.
Fairing: Allowed.
Seat: Stock OEM or seat with a step to prevent the rider from sliding backwards. (Motorcycle must have a manufactured seat on it.)
- ELECTRICAL
Ignition: Any ignition system is allowed.
Charging System: No charging system is required.
Starting System: Electric or kick. (No external starter, no push starts, no rollers. No jump starts from an external battery will be allowed in the staging lanes.)
Control Switches: Must be mounted and constructed in a safe, craftsman-like manner. Must have an emergency kill switch.
Computers: Only data gathering computers are allowed.
Lights: D.O.T. approved light system. Hi-low beam, taillight and brakelight must work.
- RIDER
Credentials: Valid AHDRA 7.90 competitor license.
Helmet: Full coverage helmets only! Must be Snell-2000 or ECE 22.05 approved. Eye protection required.
Protective Clothing: Full finger leather gloves with knuckle armor and palm reinforcement, one piece or full circumference zippered leather suit with knee, elbow and shoulder armor or reinforcement, spine/back protector and above the ankle leather boots with toe area reinforcement are required.
- TECH
Tech: All motorcycles must be teched in before practice. Motorcycle, rider and his protective gear must be present at tech area. Tech official will have final say on any unclear rule or equipment.