SUPERGAS

Photo Courtesy of Larry Pfister

TERRY BROWN

#1 SUPER GAS

- SPONSORS -
KBR Custom Cycles / Boring Mfg.
Time Machine NW
Columbia Harley-Davidson of Vancouver, WA

Requirements and Specifications

Designation: "S/G" preceded by bike number. Reserved for Street Legal or Non-Street Legal V-twin motorcycles with any frame configuration. This class is 'heads up', pro tree with 9.90 index.

1. Engine
(a) Engine:

Must keep design features of Harley Davidson engines (45°‑90° V-twin with pushrods). Crankcase vent tube must be routed to catch can or have a non-spilling breather system on bike. Any engine modifications are legal. Example: fuel injection, supercharger, E.F.I., turbo-charger, nitrous oxide, double engine, etc.

Belly pans to catch oil drips Mandatory.

(b) Fuel:

Gasoline, alcohol and nitrous allowed. No Propylene Oxide.

(c) Fuel System:

Fuel shut off valve mandatory. Nitrous bottles must be stamped Dot-1800 rating and be securely mounted inside perimeter of frame. All nitrous bikes must have thumb (butterfly) body fasteners. All body fasteners must be able to be removed by hand without the use of tools.
2. Drive Train
(a) Chain and/or belt guard mandatory.

Must have front and rear guards to cover the width and at least the top run of the center line of the sprocket of any chain or belts. Chain guard should be constructed from .060 inch steel or .125 inch aluminum mounted on at least two points that are securely mounted to the frame. Rear mounting point to be no more than six inches in front of rear axle. No clamps or tie straps.

(b) Clutch:

Any type of clutch or belt drive may be used. Clutch assembly must have top and at least half of the side surface covered by .060 inch steel or .125 inch aluminum.

(c) Transmission:

Any transmission may be used. Air shifters are legal.

3. Suspension and Brakes
(a) Brakes:

Front and rear hydraulic type brakes are mandatory. Minimum rotor size is 9 inch diameter x .125 inch thickness. Rotors may be drilled only is minimum diameter and thickness are maintained.

(b) Controls:

Handlebars must be at least 20 inches overall with grips removed. Handlebar controls must be located in a safe, workable position and mounted in a safe craftsman-like manner. Snap back throttle return mandatory. Foot pegs and brake pedal may be rear set. Any brake or shifter that can be operated from the legal foot peg location, with the foot on the peg, will be permitted. Air shifters permitted. Air shift bottles must be stamped Dot-1800 pound and be securely mounted. No hose clamps or tie straps.

(c) Suspension:

Front suspension minimum fork diameter is 30 mm with a minimum travel of 2 inches. Steering dampener mandatory. Rear suspension not recommended.

(d) Wheelie Bars:

Mandatory with slick, optional with V-rated dot tire. Wheels must be non-metallic. Minimum specified construction of .75 inch chome moly and .058 wall thickness.

4. Frame
(a) Frame:

Any type permitted. Frames to be mig or tig welded. Recommend frame material 4130 chrome moly.

(b) Wheelbase:

Recommend 70 inches length.

(c) Ground Clearance:

Minimum of two inches with rider on bike and 10 P.S.I. in rear tire. (including exhaust)

5. Wheels and Tires
(a) Wheels:

Front wheel: minimum diameter 16 inches; maximum diameter 19 inches. Rear wheel: minimum diameter 15 inches; maximum diameter 18 inches.

(b) Tires:

Must be V-rated dot tire or tire specified for racing use by manufacturer. Rear tire any width. Minimum front tire width is three inches.

6. Body
(a) Body:

All bikes must have front and rear fender with fuel tank or shell to resemble street bike appearance. All components must be mounted and constructed in a safe, craftsman-like manner.

(b) Fairing:

Permitted. Must be mounted securely.

(c) Seat:

Stock OEM or seat with a step to prevent rider from sliding backwards.

7. Electrical
(a) Ignition:

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.

(b) Charging System:

Optional.

(c) Starting System:

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

(d) Computers:

Only data gathering computers are allowed.

8. Rider
(a) Credentials:

Must have a valid provincial or state riders license. Racers running 9.99 seconds or quicker must have a valid CMDRA competition license.

Starting in 2007 only CMDRA Licenses will be accepted if you’re running 9.99 or quicker

(b) Helmet: Full face helmet meeting Snell 00. Must have a Snell tag.

(c) Protective Clothing:

Must have leather jacket. Must have leather boots/shoes which cover above ankle. Must have leather gloves. All protective clothing must be in good condition. Full leathers if running over 120 mph.

(d) Race School mandatory for first time racers