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Click the link of the class you are interested in to jump to some common definitions of racing vehicles and classes here at Jackson Speedway.

Road Course: Kid Kart, Jr. Sportsman, Jr. Can, Sr. Sportsman, Jr. Purple Gas. Briggs Medium

Cement Oval: Kid Kart, Jr.Purple Gas, Sr. Box Stock, Briggs Heavy, Future Stars, Mini Cup, Dwarfs

Dirt Oval: Kid Sprints, 250 Ninja Open and 250 Ninja Restricted, Sportsman, 600 Multi Open and 600 Restricted

For more information, please contact a track official by using our Contact page.  

 

Kid Kart:

This is an Entry level to racing for kids ages 5 to 8 years old.  Most used Kid karts can be purchased for very little money and usually start at $900 to $1500.  New karts can be purchased starting around $2500.  The kid kart utilizes a 50cc Comer racing 2-cycle engine that is equipped with a pull start.  The gas to oil mixture is usually 8oz of a good racing oil such as Buris blend containing castor oil and synthetic per gallon of regular unleaded fuel and can really help the performance of the engine   The engine has a fixed dry clutch and sliding carburetor.  The drive gear affixed to the clutch is a 10 tooth as required by WKA with the axle gear at an 89 tooth maximum.  This combination of gear ratio is perfect for either the road course or cement oval here at Jackson Speedway.  Tire selection can improve performance of the kart but average tire size is 10 x 4.50-5 (10 inch diameter, 4.5 inch wide, 5 inch wheel size).  Air pressure can be controlled to increase the performance of the kart however, it is always best to adjust the pressure according to the manufacturers recommendations.  Most chassis come complete with the body work and seat included (see picture below).  Other items needed to go racing is a Snell rated 2000 helmet, a neck brace, racing gloves and a chest protector.  Any quality racing jacket or pants is recommended but not required as long as the driver's skin is not exposed and safety is taken into consideration, then jeans and a jacket can be worn. A "Pill" restrictor plate is required for the oval course and can easily be slid into the carburetor prior to start.  Average speed can vary depending on the setup but top speed can reach up to 35 or 40 mph

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Jr. Sportsman:

The Junior sportsman class for ages 8 to 12 employs a "cadet" style frame often 28mm tubular frame and 30mm axle although, one can use a 30mm frame and 40mm axle.  Components may vary for desired performance although some things remain as staples in this class.  A Walboro WA55 carburetor, Can style muffler and 2 hole air box are required in Jr. Sportsman class while a total weight with driver and safety equipment must be a minimum of 250 pounds.  Pictured below are a typical junior sportsman chassis and the popular Yamaha KT100 motor which is the engine package of this class.  Seat size may vary on the size of the driver as well as chassis style, body panels and tire configuration.  The engine requires an external electric starter motor available through most kart supply stores such as MM Racing Karts.  The Clutch and drive gear are interchangeable but a single or double disk dry clutch with a 12 tooth drive gear works best on the road course at Jackson Speedway.  Tire and wheels, as well as tire pressures, may also vary but a 10 x 4.5 -5 front wheels and 11 x 5 - 5 rear wheels work best while keeping in mind that tire pressure can be crucial to performance as long as manufacturer recommendations are not exceeded.  Rear sprockets may also vary but a good start is an 88 tooth gear.  As with the Kid Kart division, using a quality racing oil mixed with unleaded fuel can help the performance of the engine.  The rear axle mounted disk brake uses hydraulic brake components and as with  many of the equipment in the class can vary however the key to a good setup is less rolling weight therefore a slotted brake and alloy components throughout the chassis can make a big difference in the performance.  This is a fast kart class with an average top speed of about 60mph.  Once again, Safety gear is required Snell rated 2000 helmet, a neck brace, racing gloves and a chest protector as well as a racing suit to adequately protect the driver.

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Jr. Can:

The Junior can class for ages 12 to 15 also employs a "cadet" style frame often 28mm tubular frame and 30mm axle although, one can use a 30mm frame and 40mm axle.  The frame and engine packages are similar to the Jr. Sportsman class except the Jr. Can uses a Walboro WB3A larger carburetor and the minimum weight with driver and safety gear is 305lbs.  Most of the other components  are identical including tire and wheel sizes and muffler and air box packages.  Because of the larger carburetor, speeds are also increased over the junior sportsman reaching top speeds close to 70mph or more.  Again see the above picture for the Jr. Sportsman class.  Because of the higher rates of speed and increased RPM it is recommended to utilize a good 2 disk dry clutch however clutch packages can vary depending on the performance desired.  Safety gear is required Snell rated 2000 helmet, a neck brace, racing gloves and a chest protector as well as a racing suit to adequately protect the driver.

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Sr. Sportsman:

The Senor Sportsman for Ages 16 and up employs a larger frame than the Junior Can or Junior Sportsman.  The frame is 30 to 32mm tubular construction with a 40mm axle.  The Wheel base is also longer to accommodate adult size drivers and has 2 classes available, a light class at 335 lbs and a heavy class at 360 lbs.  The Engine still utilizes the popular Yamaha KT100 as pictured above in the Jr. Sportsman but the carburetor uses the larger Walboro WB3A.  Most of the other components are similar to the Junior class and seat size can be adjusted to accommodate the size of the driver.  Tire and wheels are slightly bigger in the Senior class 10 x 4.5 -5 front wheels and 11 x 7.1 - 5 rear wheels work best while keeping in mind that tire pressure can be crucial to performance as long as manufacturer recommendations are not exceeded.  Because of the higher rates of speed, average of 70+ mph, and increased RPM it is recommended to utilize a good 2 disk dry clutch however clutch packages can vary depending on the performance desired.  A third axle bearing is often preferred among the Senior class as it adds stability  through the turns at the higher rate of speed.  Safety gear is required Snell rated 2000 helmet, a neck brace, racing gloves and a chest protector as well as a racing suit to adequately protect the driver.  Typical starting gears are a 12 tooth front drive gear and 90 tooth axle gear however, these can be adjusted to increase performance.  Like the Jr Sportsman and Jr. Can, cost can vary but a good used kart can cost as little as $1200  with newer chassis costing upwards  of $3000.  Note the picture below is only for demonstration purposes and do not reflect a preference by Jackson Speedway. 

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Briggs Purple Gas

The drivers in this class are 8-13 years old. The karts have a Briggs. 5hp engine with a restrictor plate to slow them to a top speed around 40mph. The top three finishers receive trophies.

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Briggs Box Stock 

The karts have a Briggs. 5hp engine that burns gas. Top speed around 50mph. The drivers in this class are 14 and older. The top half of the field receives prize money.

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Briggs Heavy 

These are the fastest go-karts on the oval. The age for Briggs Heavy is 15 and older. They are powered by a Briggs. 5hp blue printed methanol burning engine. The kart and driver must weigh a minimum of 375 lbs. The top half of the field receives prize money.

 

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Future Stars Mini-Cup 

The drivers in this class are between 8-15 years old. The cars have a Honda 13hp engine with a 9hp carburetor that acts like a restrictor plate to slow them down. The cars are equipped with shocks, springs and have all the adjustments like a full size race car. The top three finishers receive trophies.

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Mini-Cup

Mini-Cup drivers are at least 13 years old. The cars have a Honda 13hp engine. They are equipped with shocks, springs and have all the adjustments like a full size race car.

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600cc Dwarf Cars 

The age for dwarf car drivers is 16 and older. This is the fastest class on the oval with an average speed at over 55 mph. The cars are powered by a 600cc sport bike engine and still inexpensive for racing with the average car only costing $3,500.  The top three finishers receive trophies.

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Kid-Sprints 

The kid-sprints are the youngest class raced on the dirt oval. Drivers are between 5-11 years old. The cars are powered by a Briggs. 5hp engine with a top speed of 35mph. Every participant in this class receives the same trophy.

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250 Ninja Restricted

The cars have a Ninja 250cc sport bike engine with a restrictor plate to slow them to a top speed around 40mph. The driver must be at least 8 years old. The top three finishers receive trophies.

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250 Ninja 

The drivers in this class are 10 and older. The engines are out of a Ninja 250cc sport bike. The average cost for either Ninja car is only $2,500. The top three finishers receive trophies.

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600 Restricted

These cars run on gas or methanol and have a 600cc sport bike engine with a restrictor plate. The drivers are 10 and older. The top three finishers receive trophies.

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270 600 Wingless Sportsman 

The driver must be at least 12 years old. The cars run on gas or methanol and have a 250cc dirt bike engine or a 600cc sport bike engine.

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600 Multi

This is the largest and most competitive class at Jackson Speedway. The cars can have up to a 639cc sport bike engine that runs on gas or methanol. The drivers are 16 and older. 

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