RULES & REGULATIONS
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H.S. CLASS
[HOT STREET]
Designation: "HS" followed by bike number.Reserved for V–Twin cylinder configuration 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). This is a heads up, .400-second, Pro tree class. Combined weight of motorcycle and rider must equal at least 8 pounds per cubic inch, but no less than 675 pounds regardless of displacement, at the conclusion of all runs.
Requirements and Specifications
- ENGINE
Engine: Only push-rod, air-cooled, 45-degree V-Twin cylinder engines are allowed. Maximum displacement is limited to 98 cu.i. Engine case and cylinder heads must be stock or stock appearing aftermarket castings. No raised port heads allowed. Intake port, exhaust port and stud locations will be verified against templates based on dimensions and angles of the Buell XB9 and the Harley-Davidson Screamin' Eagle "HTCC" cylinder heads. Only one (1) sparkplug is allowed for each cylinder. Internal modifications are legal. Valves are limited to two (2) per head. Compression releases are not allowed. A single oil return line may be added to each cylinder head and routed directly to the crankcase. Engine must maintain steel crankshaft and rods. Cylinders must be stock appearing. All engines must be naturally aspirated and all air must be delivered through a single, float type carburetor and a one-piece split runner manifold or through a stock Harley-Davidson fuel injection throttle body (no physical modifications are allowed to the throttle body). Closed loop EFI control systems are allowed. Must be approved by Tech Inspector. No portion of the intake or exhaust manifold may extend past the mounting/sealing surface of the cylinder head. No fuel pumps are allowed on carbureted engines. Crankcase and all tanks containing fluids must have vent tubes routed to catch can or have a non-spill breather system on motorcycle. Active crankcase evacuation systems are not allowed.
Fuel: VP Racing Fuels C-10 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: Only stock or aftermarket castings are allowed. Transmission must be stock appearing. Internal modifications are limited to back-cut, clearance and lightening operations. Automatic transmissions are not allowed. No shifting devices are allowed other than stock or aftermarket foot operated shift levers. Clutch must be stock type and spring actuated. No weights, balls or levers (other than a hand operated clutch lever) may in anyway enhance nor control the actuation or release of the clutch.
- 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 must be in the stock location. 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. Travel limiting straps are not allowed. Rear suspension may be strutted.
- FRAME
Frame: Only stock, production, Harley-Davidson or Buell frames for licensed street motorcycles are allowed. Modifications affecting the structural integrity (for better or worse in the opinion of AHDRA) are prohibited.
Ground Clearance: Minimum of 2 inches with rider on motorcycle and 10 PSI in the rear tire (includes exhaust and kickstand).
Wheel Base: Maximum wheelbase is 68 inches. Wheelbase may be obtained by lengthening the swing arm. Swing arm extensions will be inspected for quality of workmanship and structural integrity.
Wheelie Bars: Wheelie bars are not allowed.
- WHEELS AND TIRES
Tires: Tires must be V rated, DOT motorcycle tire. No car tires are allowed. Tires must have 2/32” of tread on front and rear. The tread radius of the tires, when viewed in cross section, shall not be greater than 12 inches.
Wheels: Stock OEM wheels or aftermarket performance wheels. Any size.
- BODY
Body: Stock OEM fenders and gas tank, or custom fenders and gas tanks are allowed but must be mounted and constructed in a safe, craftsman-like manner. 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. No delay boxes, two steps or electronic throttle stops.
Charging System: Stock OEM charging system must be present and in working order.
Starting System: Electric or kick on board starters are required. No jump-starts from an external battery are allowed in the staging lanes. No rollers. No push starts. No dry hops in pits.
Control Switches: Must be mounted and constructed in a safe, craftsman-like manner. Must have an emergency kill switch.
Computers: Computers are not allowed. No electronic devices with the exception of a shift light are allowed.
Lights: D.O.T. approved headlight (high and low beam), taillight and brake light must be present and working properly.
- RIDER
Helmet: Full coverage helmets only! Must be Snell-2000 or ECE 22.05 approved. Eye protection required.
Protective Clothing: Leather jacket, full-finger leather gloves and hi-top leather shoes or boots. Riders exceeding 120 mph must wear full leathers. AHDRA highly recommends reinforcement and/or armor in the knee, elbow, shoulder and knuckle areas. Back/spine protectors are mandatory.
- 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. Winner and runner-up will be subject to teardown after final round.