Reflective numbers are not allowed. Numbers and corresponding letters mat not have a mirror finish. Letters must be 5" tall, and placed above the number.

You may use Gold Leaf.

If your numbers are borderline, not readable you will need to fix them. You will be given one warning during practice to fix your numbers. Numbers not fixed by race time will result in disqualification and you will not be allowed to enter the racetrack.

Non-Wing Classes must have a number on the nose of your car. The letter must be above the number and legible.

Winged Classes must have numbers on both sideboards.

All cars must have legible numbers on the tail tank.

Click on the class to view the details on the rules.

Effective immediately, the following CP-Carrillo connecting rods will be allowed.

Suzuki- 06/Present #PSR9586
Yamaha 99/00 #PSR5554
Yamaha 01/05 #PSR9585
Yamaha 06/Present #PSR9584
Kawasaki 07-12 #PSR10386
Kawasaki 13/Present #PSR9661

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 engine parts must remain stock with no modifications, metal removal, blueprinting.

Valve seat inserts may be reworked. 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.

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.

Fuel injection engines may run carburetors. Injected with power commander allowed gas or alcohol. No timing modules allowed. Fuel injection engines running carburetors may change all fuel metering devices to tune fuel curve, Billet intake boots allowed.

Modification of oil pan & pick up allow allowed or aftermarket ok.

Modification to thermostat cover allowed or aftermarket ok.

Modification to water pump cover allowed or aftermarket ok.

Any air box, stock appearing CDI, aftermarket washable replacement air filter, power commander on fuel injection models only.

Any 600cc OEM CV carburetors (no flat slides allowed).

Stock ECU, PE3-IG2 and PE3-8400 Engine control units are permitted for use with carburetors and Stock Fuel Injection.

Fuel cell securely mounted. Tank used for qualifying heats must remain for all events.

No flammable liquids allowed in cooling systems.

EFFECTIVE 2020 RACE SEASON: All stock classes will be allowed to run Electronic or Mechanical Injectors with a mechanical fuel pump with stock OEM throttle bodies or carbs ONLY will be allowed. No mixing of manufacturers.

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 engine parts must remain stock with no modifications, metal removal, blueprinting.

Valve seat inserts may be reworked. 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.

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.

Fuel injection engines may run carburetors. Injected with power commander allowed gas or alcohol. No timing modules allowed. Fuel injection engines running carburetors may change all fuel metering devices to tune fuel curve, Billet intake boots allowed.

Modification of oil pan & pick up allow allowed or aftermarket ok.

Modification to thermostat cover allowed or aftermarket ok.

Modification to water pump cover allowed or aftermarket ok.

Any air box, stock appearing CDI, aftermarket washable replacement air filter, power commander on fuel injection models only.

Any 600cc OEM CV carburetors (no flat slides allowed).

Stock ECU, PE3-IG2 and PE3-8400 Engine control units are permitted for use with carburetors and Stock Fuel Injection.

Fuel cell securely mounted. Tank used for qualifying heats must remain for all events.

No flammable liquids allowed in cooling systems.

EFFECTIVE 2020 RACE SEASON: All stock classes will be allowed to run Electronic or Mechanical Injectors with a mechanical fuel pump with stock OEM throttle bodies or carbs ONLY will be allowed. No mixing of manufacturers.

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 engine parts must remain stock with no modifications, metal removal, blueprinting.

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.

Fuel injection engines can run carburetors. Fuel injection engines running carburetors may change all fuel metering devices to tune fuel curve.

Fuel Injection allowed. Injection must be OEM, stock OEM throttle bodies no mixing manufactures (i.e. Suzuki on Suzuki, Yamaha on Yamaha.) with OEM boots in place.

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.

Any air box, stock appearing CDI, aftermarket washable replacement air filter.

Any 600cc OEM CV carburetors (no flat slides allowed).

Stock ECU, PE3-IG2 and PE3-8400 Engine control units are permitted for use with carburetors and Stock Fuel Injection.

Joes Racing Product Tulsa Shootout Carb Adapter (they will be labeled with TSO.)

Restrictor Plate must be King Racing Product Restrictor Plate .750" inside diameter. No exception. Any tampering with or altering will result in disqualification.

1. Age. Drivers ages 6 through 12 (A driver whose 13th birthday falls during the racing season will be allowed to finish the season in which they began accruing points before their birthday. Racing season starts March 1st .) may compete in the "J" Class. It is recommended that parents/guardians read and understand these rules.

2. Roll cage. Roll cages shall be at least 1 inch .083 wall thickness mild steel, or 1 inch .065 wall thickness chromoly steel minimum. The front section of the cage shall be no further back than the steering wheel. Roll cage shall have sufficient fore and aft bracing and strength to support the weight of the car & driver in case of an upset. Cage shall have gussets at the intersecting bars to the uprights. Bends must have at least 3-inch radius. No square or pointed corners allowed. Roll cage must be a minimum of 3 above the driver’s helmet. It is mandatory to install a cross brace behind the seat to support the shoulder harness.

3. Cockpit Controls. On and off switches must be on dash, top of the cowl or on steering wheel. On/off switch must be functional. No radio communication is allowed with the car or the driver. The box that hangs on the fence was clarified as not being radio communication to car or driver and will be allowed. (This is the infrared transmitter used to trigger the lap timer function on Mychron style devices. Concerns had been raised that this "box" might be capable of "communicating" with a car on the track. Further review by the board proved no "communication" was possible.) Cockpit controls: carb adjusters kill switch and engine monitor. No wing sliders or pan hard adjuster’s driver operated in cockpits.

4. Fuel. ALL JR. SPRINTS MUST BRING THEIR RACE CARS TO THE TRACK WITH THE FUEL TANK COMPLETELY EMPTY. You must purchase your methanol or pump gas from the racetrack. You do not need to bring fuel. NO Nitro Products Allowed. NO UPPER LUBE OR ADDITIVES ALLOWED FOR JR. SPRINTS - NO EXCEPTIONS!!! Edit: You will get Fuel from the Tulsa Shootout, but you will fuel your car. Fuel will be checked.

5. Weight. Jr. Sprint Class cars, minimum car and driver weight 400 lbs.

6. Suspension. Coil-over shock suspension or torsion bar suspension allowed. Tread; Maximum 46 inches. Minimum 32 inches, center to center of tires. Wheelbase; Maximum 52 inches. Minimum 50 inches, center of front axle to center of rear axle. Rear axle to be steel 1 1/4" min diameter or the new aluminum axle. Steering; Front wheels must be connected by a solid or tubular tie rod. Rear wheel drive only. All suspension bolts except wheel nuts must be secured by some type of locking device.

7. Shocks. Aluminum or steel body shocks are legal.

8. Tires and Wheels. Wheels to be 8" diameter, steel or aluminum. All four corners of tires are to be Hoosiers. The right rear spec tire is to be the Hoosier Jr. Sprint tire16.0/8.5/8/8 RD 20. You can groove or sipe all tires. Wheels must be held on with 4 or more standard lug nuts or knock-off hubs. Three spoke front wheels may be ran if they are manufactured that way.

9. Bodies. All cars must have complete bodies of Sprint Car design only. Tail sections must be in place for time trials and all races. There must be a metal firewall between driver and engine, made of 24-gauge steel or .0625" aluminum. Body of car must be made of aluminum, metal, fiberglass or high impact plastic. All cars must be painted an attractive color or colors. No rear view mirrors. The only part of the car allowed to be dismantled for driver to enter or exit is a quick release steering wheel hub. Mud guards must be aluminum, metal, fiberglass or high impact plastic. There will be no tops or body encasements allowed. Minimum opening on the right side of the car will be 14" from top of roll cage to the top of the mud guard or sissy bar and 16" minimum from front down tube to the back. All mechanically operated devices must be mounted below the driver’s shoulders for safety. All fuel tanks must be equipped with a one-way check valve designed to prevent the spillage of fuel from the fuel tank vent in the event of a rollover.

10. Transmission. The drive will be by engine or jackshaft mounted clutch. No axle mounted clutches allowed. No direct drive will be allowed. Chain guards will be made of .060-inch-thick aluminum or equivalent and will run on top of chain from the front of the front sprocket to the center of the rear axle. Driver must not be able to touch the chain or sprockets while sitting in the cockpit.

11.Wings. Right side board, maximum 42" x 20" - 16” x 16” minimum . Left side board, maximum 42" x 20" - 18” x 18” minimum. Overall wing size minimum 5.5. The wing cannot be mounted outside the centerline of the tires. Side boards may not extend more than 3" beyond center section and sides must cover center section. All wings must have 1/16" radius edgesor edging. No raw edges. No wood except for ribs or spars inside center section. Nose wings cannot exceed 24"x 18", and must carry car number. Side boards not to exceed 8.5 inches tall and 21 inches long. Top wings are mandatory to enter a night's event. Cars may finish without a wing if no replacement is available. Side boards must be 90 degrees to the center section. The side board kick out cannot exceed 2 inches. It is your responsibility to check the size of your wing to make sure it is correct.

1. Hubs. Front hubs; Go kart type with 5/8" bearings and 5/16" wheel studs minimum. Rear hubs; Douglas 5 x 130 Go kart type or equivalent or the new aluminum axle and wheels or any new style hub approved by tech inspection.

2. Engine Rules. Briggs & Stratton World Formula engines as defined by the Jr Sprint USA. The Briggs World Formula will use a RLV 5442S header or stock pipe and RLV 4100 silencer as defined in the Jr Sprint USA Briggs World Formula rules. Stock pipes may be cut and turned as necessary to fit the race car as long as the pipe still retains the original length, diameters and volume as the original stock pipe.kind for traction control. No Sprocket or Transmission sensors for Traction Control. NO TRACTION CONTROL of any type specifically listed or not.

OUTLAW, NON-WING OUTLAW, A-CLASS, STOCK NON-WING

Heat Races lined up according to draw (9-10 cars per heat), passing points in effect.

Top 112 in passing points from Heat Races advance to 8 Qualifying Races (14 cars each) with a four-car inversion in effect for each Qualifying Race. Thus, high point driver from Heat Races will start fourth in the First Qualifier and so on (top 32 make invert – 33rd on back start third row and back in Qualifiers).

Passing points in Qualifying Races as well.

Top 16 in combined passing points from Heats & Qualifiers advance to Saturday night's A Main. Those 17th to 112th in combined passing points lock into 8 “B” Mains.

113th through 208th after heat races to eight (8) “C” Mains), 209th to 304th to 8 “D” Mains, with 305th to 400th to 8 E Mains and 401st and back to 8 “F” Mains (4 in Non-Wing Outlaw). Top two from each “F” Main transfers to “E Mains, top two from each “E” Main transfers to “D” Mains, top two from each “D” Main transfer to “C” Mains, top two from each “C” Main transfer to “B” Mains, top two from each “B” Main transfer to Saturday night's A Feature Qualifier. “B” Main winners earn positions 1-8 in LCQ lineup up in order of combined Heat and Qualifying Race points, “B” Main runners-up earn positions 9-16 in LCQ lineup in order of combined Heat and Qualifying Race points.

Top 8 from A Feature Qualifier advance to Tulsa Shootout Championship A Main event.

RESTRICTED

Heat Races lined up according to draw (8-9 cars per heat), passing points in effect.

Top 96 in passing points from Heat Races advance to 8 Qualifying Races (12 cars each) with a four-car inversion in effect for each Qualifying Race. Thus, high point driver from Heat Races will start fourth in the First Qualifier and so on (top 32 make invert – 33rd on back start third row and back in Qualifiers).

Passing points in Qualifying Races as well.

Top 16 in combined passing points from Heats & Qualifiers advance to Saturday night's A Main. Those 17th to 96th in points to 8 “B” Mains, 97th on back from heat race passing points to 8 “C” Mains. Top two finishers from each “C” Main advance to “B” Mains, top two finishers from each “B” Main advance to Saturday night's A Feature Qualifier. “B” Main winners earn positions 1-6 in LCQ lineup up in order of combined Heat and Qualifying Race points, “B” Main runners-up earn positions 7-12 in LCQ lineup in order of combined Heat and Qualifying Race points.

Top 8 from A Feature Qualifier advance to Tulsa Shootout Championship A Main event.

JUNIOR SPRINT

Heat Races lined up according to draw (7-8 cars per heat), passing points in effect.

Top 72 in points to 6 Qualifying Races (12 cars each) with a four-car inversion in effect for each Qualifying Race. Thus, high point driver from Heat Races will start fourth in the First Qualifier and so on (top 24 make invert – 25th on back start third row and back in Qualifiers).

Passing points in Qualifying Races as well.

Top 12 in combined passing points from Heats & Qualifiers advance to Saturday night's A Main, 13th to 60th in passing points to 5 “B” Mains, 61st on back from heat race passing points to 5 “C” Mains. Top two finishers from “C” Mains transfer to “B” Mains, top three finishers from each “C” Main advance to “B” Mains, top two finishers from each “B” Main advance to Saturday night's A Feature Qualifier. “B” Main winners earn positions 1-5 in LCQ lineup in order of combined Heat and Qualifying Race points, “B” Main runners-up earn positions 6-10 in LC lineup in order of combined Heat and Qualifying Race points and third-place in “B” Mains earn positions 11th-15 in LCQ lineup in order of combined Heat and Qualifying Race points.

Top 8 from A Feature Qualifier advance to Tulsa Shootout Championship A Main event.