Junior Class Rules
| 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) may compete in the "J" Class. | |
| 2) | ROLLCAGE |
| Roll cages shall be at least 1 inch .083 wall thickness mild steel, or 1 inch .065 wall thickness | |
| chromoly steel. 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 | |
| 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 in above the | |
| drivers helmet. It is mandatory to install a cross brace behind the seat to support the shoulder harness. | |
| 3) | BUMPERS and NERFS |
| Car must have bumper extending beyond the front and rear tires. Nothing may extend beyond a tangent | |
| line from the outside edge of the tires to the bumpers. Nothing may extend beyond the outside edge of the | |
| tires or wheels, whichever is the widest. No sharp corners or design as to hook or damage. All cars must | |
| be equipped with nerfing bars. Nerfing bars must extend to inside edge of tires, but not beyond the | |
| outside of tire. | |
| 4) | SAFETY |
| Seat belts must be securely attached to the car and used at all times. Metal to metal latches only. 5 point | |
| seat belts, shoulder harness and sub strap are required. Belt dates must not be over three years old. | |
| (Example: Oct 06 may be used in 2007, 2008 and 2009.) Arm restraints are mandatory and must be | |
| adequately adjusted to keep the drivers hands below the top of the roll cage. Helmets must be full head | |
| coverage competition type and one of the three latest SNELL approvals. All drivers will wear a name | |
| brand flame-retardant uniform. Neck braces, cage nets and/or head and neck restraints with a SFI 3.2-1 | |
| rating or higher are mandatory. SFI gloves are mandatory for safety. | |
| 5) | ELECTRICS and ELECTRONICS |
| On and off switches must be on dash, top of the cowl or on steering wheel. On/off switch must be | |
| connected and functional. No radio communication is allowed with the car or the driver. Cockpit controls: | |
| carb adjusters, kill switch, starter button and engine monitor. No wing sliders or pan hard adjusters | |
| driver operated in cockpits. | |
| 6) | BATTERY |
| All wet cell batteries mounted in the cockpit must be covered and vented outside the cockpit area. | |
| 7) | FUEL |
| Cars must run Sunoco Purple or VP C12 gasoline. Performance enhancing additives are prohibited | |
| 8) | WEIGHT |
| Junior class cars, minimum car and driver weight 400 lbs. | |
| 9) | SUSPENSION |
| Coil-over shock suspension only. Tread: Maximum 56 inches outside to outside of rear tires. | |
| 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 only 1 1/4" min dia. 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. | |
| 10) | Shocks |
| Aluminum or steel body shocks are legal. | |
| 11) | BRAKES |
| Brakes will be of sufficient strength so as to slide the wheels while the car is in motion at any given time | |
| 12) | TIRES and WHEELS |
| Wheels to be 8" dia steel or aluminum non-beadlock only. Right rear spec tire to be 16 x 8.50 x 8 | |
| American Racer JKKN8 stamped NMMA SD44. There can be no grooving, siping, softening or | |
| altering the tire in any way. It should be as it arrives from the manufacturer. Wheels must be held on | |
| with 4 or more standard lug nuts or knock-off hubs. | |
| 13) | BODIES |
| All cars must have complete bodies. 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 .050" aluminum. | |
| Body of car must be made of aluminum, metal, fiberglass or high impact plastic. 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. All mechanically operated devices must be mounted below the drivers 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. | |
| 14) | 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 .090 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. | |
| 15) | WINGS |
| Right side board, maximum 42" x 20". Left side board, 42" x 20". Minimum size is 6 sq. ft. 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 edges or | |
| edging. No raw edges. No wood except for ribs or spars inside center section. Wings sides cannot be | |
| more than 4" below top of roll cage. Nose wings cannot exceed 24"x 18", and must carry car number. | |
| Top wings are mandatory to enter a night's event. Cars may finish without a wing if no replacement is | |
| available. | |
| 16) | NUMBERS |
| All cars must have legible numbers painted in contrasting colors on both sides of car and the nose. | |
| Minimum height of numbers is 8" on the nose and nose wing, 10" on each side of the tail and 12" on | |
| the wing. Numbers must be separated from advertising so they will be readable. No gold or silver | |
| leaf or prismatic numbers will be allowed on the cars. Remember: The easier your numbers are to read, | |
| the easier they are to score! | |
| 17) | BALLAST |
| Any material used for ballast must be firmly attached as a part of the car's structure. No liquid or | |
| loose ballast such as water, fuel, oil, sand bags, rocks, log chains etc. allowed. | |
| 18) | 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. | |
| 19) | Engine |
| The two engines approved for the Jr. Sprint Class are the 100cc Yamaha KT-100-S and the | |
| Briggs & Stratton World Formula. Yamaha engines must use the SSX by RLV 4-hole canister | |
| muffler. This comes in 3 styles: up, down, left and right hole position. This is also available in 4 hole | |
| 90 degree model. The Briggs World Formula will use a RLV 5442S header and RLV 4100 silencer | |
| or stock pipe as defined in the NMMA Briggs World Formula rules. Loosely mounted | |
| mufflers/silencers will mean disqualification. Engine legality will be determined by using the | |
| Yamaha specification sheets by the NMMA. The IKF rules for KT100 apply except for the carburetor | |
| and exhaust. Methanol carburetor will be the Tillotson USA HL383A, drilled for alcohol and change | |
| to Methanol spark plug. |