270cc Micro Sprint Rules

Posted on 02/07/09

270cc Micro Sprints

We strive to keep the competition equal and fair for all competitors. To accomplish this, IF IT DOESN'T SAY YOU CAN,DON'T!! Try to live within the spirit of the rules. If you have any questions, please contact track officials before illegal competition.
1. All cars should be constructed to look like MicroSprints. All cars must be equipped with complete body parts: panels, belly pan, etc.
2. All cars must have legible numbers at the discretion of the scorers. No reflective numbers. Numbers must be top wing 12" tall both sides and top wing 18" tall. Front nose 8" tall or larger.
3. Roll cage thickness of .065 if six hookups. Must be well gusseted. Minimum 11/4" OD tubing. Complete frame .065 minimum size. (1' tubing may be used if wall thickness is at least .083)
4. All steering and suspension parts that are bolted together must use locking nuts, safety wire or cotter pins.
5. All cars must have a firewall to separate the motor compartment and the fuel tank from the driver.
6. The belly pan must extend from the front of the seat to the nose of the vehicle.
7. The steering mechanism must be constructed of a minimum of 5/8"rod and 3/8"heim ends.
8. The torque arm must be safely secured by 1/4" cable or chain, or reasonable safety device.
9. Radiators must be mounted so that contact cannot be made by another car.
10. All cars must be equipped with nerf bars extending to at least the inside of the tire, but not beyond the outside.
11. Welded spindles must have skid plates.
12. Sharp pointed edges or objects (excluding wings) will not be tolerated in cars. Only nerf bars can extend beyond center line of the tires.
13. The fuel shut-off valve and the kill switch must be functional and accessible to the driver.
14. All wet cell batteries mounted in the cockpit must be covered and vented out of the cockpit area.
15. Brakes must be sufficient strength so as to stop the wheels in the pits or stop the car while in motion.
16. Belt driven cars will not be allowed. Centrifugal clutches will not be permitted.
17. Seatbelts and shoulder harness must be in good condition and race approved.
18. With driver seated in the car, there must be three inches of clearance between the driver's helmet and the upper roll cage.
19. Helmets must be approved for competition, full-faceshield (Snell 90or95) required.
20. All drivers are required to wear neck braces, arm restraints and fire resistant suits. Racing gloves and shoes are required.
21. Each car must have a workable, approved fire extinguisher in their pit area at all times.
22. Minimum weigh of car and driver - 600 pounds. All added weight must be painted in white and have your car # on it. All added weight must be bolted with washers and locknuts.
23. Wheel base must be 56" minimum and 72" maximum. Car width should not exceed 60".
24. Top wing may not exceed twelve square feet. Wing panels cannot extend over the width of the tires. Height for side panels may not exceed 24 inches. Side panels must not obstruct the view of the driver and cannot exceed past center section by more than 10 inches, front or back.

ENGINE SPECIFICATIONS:

Any single cylinder 250cc full production engine. Maximum of 272cc permitted. Forced air induction will not be allowed and alcohol only. No exotic fuels or additives. 72mm Honda standard stroke, 120 over, 74MM stroke, 80 over,76mm stroke, 40 over and 77.5mm stroke, standard bore.
Anything not covered in these rules will be up to the discretion of the tech or track officials, without recourse. Safety infractions can be cause for a car to be kept out of competition until they have been corrected. Rules are subject to revision and will be judged accordingly. UNLESS THE RULES SAY YOU CAN-DON'T!!