CLASS STRUCTURE
CLASS STRUCTURES
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Thompson Kart Raceway is a member track of the WKA. Racing operations are regulated by the WKA Tech Manual unless otherwise noted.
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In the interests of our Club's membership, CKRA class structures deviate from the associated class structures listed in the WKA Tech Manual.
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If any particular exception or deviation is not specifically indicated below, then follow WKA regulations.
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It is the responsibility of the driver/crew chief to know and understand the rules.
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WKA updates their regulations as necessary throughout the year and can be viewed on the WKA website.
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CKRA also reserves the right to update regulations as necessary and will post updates on the CKRA website.
2-CYCLE JUNIOR SPORTSMAN
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ages 8 to 12
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Option One:
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Engine: Yamaha KT100S - only heads with OEM casting "Yamaha" and cylinders with Y3, Y4 or 787 are legal
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Exhaust: 4-hole can (RLV, SSX-V)
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Carburetor: Walbro WA55B
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Weight: Minimum 235 lbs.
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Option Two:
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IAME Micro Swift (details to be determined through pending testing in the spring)
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Weight: TBD
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Clutch is mandatory
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Spec Tire: OPEN
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CKRA reserves the right to make adjustments to class specs in the interest of maintaining equality.
2-CYCLE JUNIOR
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ages 11 to 15
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Option One
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Yamaha KT100S - only heads with OEM casting "Yamaha" and cylinders with Y3, Y4 or 787 are legal
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Weight - Minimum 305 lbs.
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Exhaust: 4-hole can (RLV, SSX-V)
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Carburetor: Walbro WB3A
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Option Two (pending spring testing)
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IAME KA100
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Weight - TBD
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Exhaust Restrictor - TBD
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Clutch is mandatory, NO axle clutches
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Spec Tire: OPEN
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CKRA reserves the right to make adjustments to class specs in the interest of maintaining equality.
KID KARTS
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ages 5 to 7
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Participation class per WKA rules to allow children to learn to race in a friendly, fun environment.
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No season points. Participation awards to each Kid Kart driver.
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Gearing: Chain #219, 10 tooth front sprocket, 89 tooth rear sprocket
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Tire size 10 x 450 or 460 x 5 with maximum rear tire circumference 34"
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Weight:
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Option One: Minimum 150 lbs. - for Kart with Comer 50/51cc
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Option Two: Minimum 170 lbs - for Kart with Briggs 206
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BRIGGS 206 JUNIOR SPORTSMAN
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ages 8 to 12
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Engine: Briggs Racing 206
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Exhaust: RLV pipe (#5506, #5507)
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Weight
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Option One - Minimum 265 lbs. - must use Red slide (#555733) in Carburetor with carb lock
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Option Two - Minimum 305 lbs. - must use Green slide (#555740) in Carburetor with carb lock
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Maximum kart only weight (without driver) for Green slide is 205 lbs.
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Spec Tire: OPEN
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WKA bodywork rules - Gold Cup or CIK
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CKRA reserves the right to make adjustments to class specs in the interest of maintaining equality.
BRIGGS 206 JUNIOR
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ages 11 to 15
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Engine: Briggs Racing 206
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Exhaust: RLV pipe (#5506, #5507)
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Weight
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Option One - Minimum 300 lbs. - must use Blue slide (#555734) in Carburetor with carb lock
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Option Two - Minimum 325 lbs. - must use Yellow slide (#555741) in Carburetor with carb lock
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Maximum kart only weight (without driver) for Yellow slide is 195 lbs.
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Spec Tire: OPEN
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WKA bodywork rules - Gold Cup or CIK
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CKRA reserves the right to make adjustments to class specs in the interest of maintaining equality.
2-CYCLE SENIOR
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ages 15 and up
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Option One
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IAME KA100
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Weight - 400 lbs.
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Exhaust Restrictor - 1" (Rocketech Motorsports)
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Option Two
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Yamaha KT100S
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Weight - 345 lbs.
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Exhaust - SR-Y Pipe
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Clutch is mandatory
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Spec Tire: OPEN
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WKA bodywork rules - CIK
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CKRA reserves the right to make adjustments to class specs in the interest of maintaining equality.
NOVICE GROUP(S)
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This group will be run on an as-needed basis to provide a place for new participants to learn to race without the hazard of running with seasoned veterans.
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The group can be comprised of 2-Cycle and 206 drivers of the same age group.
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Finishing position will be as if they finished at the tail end of the appropriate class.
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For example, if there were 6 entries in the 2-cycle Jr. Sportsman class, the highest finishing 2-cycle Jr. Sportsman in the Novice Group would receive 7th place points for the day, and so on with any other 2-cycle Jr. Sportsman. The same practice would apply to the 206 Jr. Sportsman in that Novice Group.
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This concept can be applied to any class if the number of entries warrant its use.
BRIGGS 206 SENIOR
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ages 15 and up
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Engine: Briggs Racing 206
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Exhaust: RLV pipe (#5506, #5507)
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Weight
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Option One - Minimum 345 lbs. - must use Green coil
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Option Two - Minimum 385 lbs. - can use optional Blue coil from Briggs Racing
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Maximum kart only weight (without driver) for Blue coil is 200 lbs.
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Spec Tire: OPEN
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WKA bodywork rules - Gold Cup or CIK
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CKRA reserves the right to make adjustments to class specs in the interest of maintaining equality.