600 Mini Sprints

ENGINES & FUEL
All Classes
No traction control.
Methanol only, NO NITRO or additives allowed.
Engine 600cc 4 cylinder 4 stroke as comes on a stock production bike for public sale in the U.S.A. No current year production engines.
Except as noted, all internal and external engine parts must remain stock with no modifications, metal removal, blueprinting.
Bore, Stroke and CC measurements will be checked and the following specs will be used to deem what is stock and legal:
http://www.hyperracing.com/Assets/files/tech_department/600_engine/Engine%20Specs.pdf

Compression test will be completed to find the “average” compression of legal stock engines, if an engine significantly above the average compression, tech may pull the head to check for milling, etc.
Valve seat inserts may be reworked. Valves must remain as produced with no modifications.
Valve springs may be shimmed with standard or aftermarket shims.
Cylinder head combustion chambers may be cleaned by bead blasting with valves seated in place. Intake and exhaust ports may not be bead blasted.
Cylinder head gaskets may be replaced only with original equipment manufacturer’s stock parts (All 3 layers of the head gasket must be used). All other gaskets may be replaced with duplicate aftermarket parts.
Light cleaning of gasket surfaces with steel wool, Scotch-Brite, etc. is allowed.
Transmission gears may be shimmed only for the purpose of proper engagement. Standard or aftermarket shims may be utilized. Aftermarket cam chain tensioner allowed for safety of motor. All factory gears must be in the transmission and functioning.
Modification of oil pan & pick up allowed or aftermarket ok.
Modification to thermostat cover allowed or aftermarket ok.
Modification to water pump Cover allowed or aftermarket ok.
Must have a functioning charging system, connected and providing more than 13 volts to the battery while the car is running, also must run a stock flywheel (no metal removal). No switches allowed to turn off charging system while engine is running.
Any air box, stock appearing CDI, aftermarket washable replacement air filter allowed.
No cockpit adjustments of any kind. If a panard adjuster is moveable and accessible by driver, it must be bolted with nylock nuts, no zip ties.
Advanced timing star is allowed.

Restricted Class
Drivers must be a minimum of 9 years old and a maximum age of 16 on Jan 1 of the current season year. Officials reserve the right to allow drivers under 9 to compete if they have had prior experience in micros, Jr Sprints, karts, etc. and prove the ability to manage the car and drive safely in hot laps or practice.
Engines must run carburetors, no fuel injection allowed, Billet intake boots allowed. Any 600cc OEM CV carburetors (no flat slides allowed).
Restrictor plate must have hole diameter .750 inside, outside must be tight against inside of boot, absolutely no allowance, plate must be against carburetors. Restrictors must be flat, no cones.
Wings: 10 sq ft. max, left sideboard 24” x 48” max, right sideboard 18” x 48” max, nose wing 18” x 24” max.
Restricted Micro Sprint 700lbs., at the conclusion of the race. Loss of any bolt-on weight during competition will disqualify the individual from that event. The hosting tracks scales will be used, they are the official scales for the event and the car and driver must meet minimum weight on the hosting tracks scales.

A-Class & Non-Wing Class
Drivers must be a minimum of 13 years old to compete in A-Class. Officials reserve the right to allow drivers under 13 to compete if they have had at least 2 years of experience in the restricted micro class. Officials also reserve the right to disallow a driver between the ages of 13 and 16 to compete in A-Class if they do not have the needed experience and can run in the restricted class.
Fuel injection engines may run carburetors. Injected with power commander/Bazzaz/Guhl/Hyper etc allowed. No mechanical fuel injection. No timing modules allowed. Fuel injection engines running carburetors may change all fuel metering devices to tune fuel curve, Billet intake boots allowed.

Weight Rule
Non-Wing Micro Sprint 750 lbs., including driver, at the conclusion of the race. Loss of any bolt-on weight during competition will disqualify the individual from that event. The hosting tracks scales will be used, they are the official scales for the event and the car and driver must meet minimum weight on the hosting tracks scales.
When running winged A-Class:
Wings: 12sq max or 10sq, left sideboard 24” x 48” max, right sideboard 21” x 48” max. Nose wing 18 x 24 max.

CHASSIS SPECS
Any micro sprint chassis is allowed, but it must pass any test prescribed by the safety inspectors. The roll cage must be of a four-post design. No elliptical (oval shaped) tubing used on or as part of the main frame structure. Minimum wheel-base (center of front wheel to center of rear wheel) of 50 inches, maximum wheel-base of 70 inches. Maximum of 50 inches from center of right side tire to center of left side tire for rear axles.
All cars must be equipped with either a tail tank & bladder OR with a safety cell.
Fuel cell securely mounted. Tank used for qualifying heats must remain for all events.
No flammable liquids allowed in cooling systems.
Bumpers and nerf bars are mandatory and must be securely mounted. No aluminum frames, rear bumpers or nerf bars. Aluminum front bumpers are allowed. Nerf bars must not be outside of tires.
Steel, aluminum or titanium brake rotors only.
Any cars with a frame that does not enclose the front axle must have the front axle tethered with “seat belt” material that is securely attached.
The right side opening of body must be a minimum of 8 inches vertical at any point.

Tires and Wheels
Right Rear tire must test with a durometer of 45 for all classes at any time during the event. Beadlocks recommended on all wheels. Approved RR tires are Hoosier Racing Tire 69/10-10 (ASCS2, D35 or NMMA tires), American Racer 70/13-10 (SPEC, MD53 or MD57).

SAFETY EQUIPMENT
All drivers are required to wear SNELL 2005 or 2010 approved helmet, a fire NOMEX uniform, protective gloves (with all the fingers), head sock and arm restraints during competition.
All cars must be equipped with adequate seat belts, shoulder harness and crotch strap. Strongly recommend a five-point hookup with 3 inch belts (2 inch belts only for smaller drivers). All seat belts should be up to date, check the manufacturing date, should be less than 5 years from that date or they are expired.
Strongly recommends the use of a HANS or other head restraint system, and fire retardant underwear. Any driver not using a head restraint system must wear a collarbone pad/neck ring.

RaceCeivers are mandatory

No two-way radio communications with the driver will be allowed. If a driver is caught with cell phones or any other listing device other than the RaceCeiver will be DQ’d

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