A Micro Sprint is defined as a racing vehicle of a single seat design built upon a racing chassis and mounted on 4 racing wheels. NO rear engine cars or aluminum frame. Car must be built to with stand the stress of high-speed competition. Sprint car appearance required.

1) APPEARANCE: The body must give the appearance of completely covering the car frame and must be fully painted. Body may be constructed of aluminum, metal, fiberglass, or high impact plastic. All cars must have large legible numbers and letters at least 12 inches high displayed on both sides of the tail and both sides of the wings panels. Colors used for numbers must stand out on the car.

2) ROLL CAGE: Roll cage must provide maximum protection with suitable space and cage diameter of 11/8” OD X .083 or 1 ¼ “ X .065 wall thickness (no 1” .065” roll cage). Roll cages may be drilled and be checked at the discretion of track tech personnel. Roll cage should be made of chromoly steel or material equivalent in strength.

3) WING: Top wing must be a single airfoil design (MAXIMUM 12 SQ.FT.) Wing panels cannot exceed over the width of the tires. Maximum side panel height of 24”. Side panels must be parallel and may not obstruct the vision of the driver. Wings are optional.

4) CHASSIS: Wheelbase must be between 58” to 65” max. Must have accessible fuel shut off valve and kill switch clearly marked. No belt drives or cenrtifical clutches. Cars must have approved firewall between driver and engine compartment as well as between driver and fuel cell. Fuel cell is recommended. All cars must have side nerf bar. Metal belly pan is required. (MINIMUM .040”). It must run from in front of seat forward past driver's feet. Cars must have front and rear bumpers. Rear bumper must be suitable for push start. Housed connections within the cockpit should be hosed. Radiator and fuel wet hoses must extend below frame. Driver compartment adjustable suspensions allowed. Wing adjustments are ok.

5) STEERING: No nylon steering hangers. Steering mechanism must be constructed of a MINIMUM 5/8” AND 3/8” heims. All universal joints on steering must be safe or racing approved. Spring loaded. Quick release type steering hub required.

6) BATTERY: Battery must be securely fastened and covered. All cars must be self-starting at start of all events.

7) SAFTEY: Seat belts must be 3” wide 4 point approved racing harness. Belts must be in good condition and be attached to the car in a safe manner; shoulder belts must run over a bar at shoulder height. Full face Snell 95 or Newer Helmet required. Approved fire suit MANDATORY, (TWO LAYER SUIT RECOMMENDED). Arm restraints, neck collars, and racing gloves must be worn at all times. Open wheel age net is recommended. Chain guard MANDATORY, aluminum racing seat is MANDATORY, must have headrest padded. Seat must be securely fastened to car.

8) WHEELS AND TIRES: 10”wheel max.

9) BRAKES: All brakes must be in good working condition and be able to skid car at all times.

600cc Micro Sprint Universal Engine Rules

NO current year motors

1. Terms and conditions: Stock parts - original manufacturer parts for the particular year and make engine. No mixing of parts from different year and make engines, even if made by the same manufacturer.

2. Overall Engine: Motorcycle Engine, 4 cylinder, 4 stroke, No current year engines, No Titanium anywhere in or on the engine, Must have engine, clutch, and transmission all in one unit, Chain Drive

3. Bore and stroke: 637cc Maximum, Standard Stroke (no strokers), 2mm overbore Maximum

4. Head and cams: NO PORTING, Blending the Bowls, or Blending the Valve Seats (exhaust or intake), Cams do not need to be stock, but the lift must be no greater than stock. (Duration is open), Cam timing may be adjustable, May use any valves, but they may be no larger than stock valves. Head may be resurfaced

5. Pistons: Any Piston may be used

6. Bottom End: No machining to remove weight from the crank (no after-market cranks), Stock connecting rods must be used (no after-market rods), Aftermarket rod bolts may be used

7. Clutch/Transmission: The clutch does not need to remain stock, but must remain operable; Transmission gears must be stock, no close-ratio gears or nonstandard gear-ratios

8. Ignition: Stock appearing ignition must be used (no after-market ignition systems, but HRC style systems are ok), No aftermarket coils, Engines that came with stock fuel injection may use an after-market add on to adjust the fuel curve and timing (essentially the same as adjusting jetting and using an ignition advancer)., Ignition advancers may be used, Rev Limiter must remain intact

9. Induction system: No forced induction (turbo charging, supercharging), Any carburetors may be used, If the engine did not come from the factory with fuel injection, fuel injection may not be used, If the engine came with a factory fuel injection, the fuel injection may be used and may be converted for use with alcohol. The stock fuel injection throttle bodies must remain, but may be modified for use with alcohol

10. Exhaust: Any exhaust may be used, as long as there is a muffler included with the system that will keep noise levels within individual track limits.

11. Charging system, The original factory charging system may not be removed, and must remain in complete working order

12. Self Starting: The engine must self-start at the beginning of the event. If it does not self-start, the car may be pushed off.

13. Fuel: Alcohol or gasoline may be used (if gasoline is used, a fuel tank bladder must be installed for safety purposes)

14. Minimum weight: Minimum weight at all times is 750 pounds, car and driver

NOTE: Anything not covered in these specifications will be to the discretion of the track tech. Personal without resource from any driver or owner. If you are running an engine not listed above, YOU Must provide all specs to engine.

For more information contact Roger Gettel at (717)-532-8581.