TKR | Class Structures

CLASS STRUCTURES

Thompson Kart Raceway is a member track of the WKA. Racing operations are regulated by the WKA Tech Manual unless otherwise noted.
In the interests of our Club's membership, CKRA class structures deviate from the associated class structures listed in the WKA Tech Manual.
If any particular exception or deviation is not specifically indicated below, then follow WKA regulations.
It is the responsibility of the driver/crew chief to know and understand the rules.
WKA updates their regulations as necessary throughout the year and can be viewed on the WKA website.
CKRA also reserves the right to update regulations as necessary and will post updates on the CKRA website.

2-CYCLE JUNIOR SPORTSMAN

ages 8 to 12
Option One:
- Engine: Yamaha KT100S - only heads with OEM casting "Yamaha" and cylinders with Y3, Y4 or 787 are legal
- Exhaust: 4-hole can (RLV, SSX-V)
- Carburetor: Walbro WA55B
- Weight: Minimum 235 lbs.
Option Two:
- IAME Micro Swift (details to be determined through pending testing in the spring)
- Weight: TBD
Clutch is mandatory
Spec Tire: OPEN
CKRA reserves the right to make adjustments to class specs in the interest of maintaining equality.

2-CYCLE JUNIOR

ages 11 to 15
Option One
- Yamaha KT100S - only heads with OEM casting "Yamaha" and cylinders with Y3, Y4 or 787 are legal
- Weight - Minimum 305 lbs.
- Exhaust: 4-hole can (RLV, SSX-V)
- Carburetor: Walbro WB3A
Option Two (pending spring testing)
- IAME KA100
- Weight - TBD
- Exhaust Restrictor - TBD
Clutch is mandatory, NO axle clutches
Spec Tire: OPEN
CKRA reserves the right to make adjustments to class specs in the interest of maintaining equality.

KID KARTS

ages 5 to 7
Participation class per WKA rules to allow children to learn to race in a friendly, fun environment.
No season points. Participation awards to each Kid Kart driver.
Gearing: Chain #219, 10 tooth front sprocket, 89 tooth rear sprocket
Tire size 10 x 450 or 460 x 5 with maximum rear tire circumference 34"
Weight:
- Option One: Minimum 150 lbs. - for Kart with Comer 50/51cc
- Option Two: Minimum 170 lbs - for Kart with Briggs 206

BRIGGS 206 JUNIOR SPORTSMAN

ages 8 to 12
Engine: Briggs Racing 206
Exhaust: RLV pipe (#5506, #5507)
Weight
- Option One - Minimum 265 lbs. - must use Red slide (#555733) in Carburetor with carb lock
- Option Two - Minimum 305 lbs. - must use Green slide (#555740) in Carburetor with carb lock
  - Maximum kart only weight (without driver) for Green slide is 205 lbs.
Spec Tire: OPEN
WKA bodywork rules - Gold Cup or CIK
CKRA reserves the right to make adjustments to class specs in the interest of maintaining equality.

BRIGGS 206 JUNIOR

ages 11 to 15
Engine: Briggs Racing 206
Exhaust: RLV pipe (#5506, #5507)
Weight
- Option One - Minimum 300 lbs. - must use Blue slide (#555734) in Carburetor with carb lock
- Option Two - Minimum 325 lbs. - must use Yellow slide (#555741) in Carburetor with carb lock
  - Maximum kart only weight (without driver) for Yellow slide is 195 lbs.
Spec Tire: OPEN
WKA bodywork rules - Gold Cup or CIK
CKRA reserves the right to make adjustments to class specs in the interest of maintaining equality.

2-CYCLE SENIOR

ages 15 and up
Option One
- IAME KA100
- Weight - 400 lbs.
- Exhaust Restrictor - 1" (Rocketech Motorsports)
Option Two
- Yamaha KT100S
- Weight - 345 lbs.
- Exhaust - SR-Y Pipe
Clutch is mandatory
Spec Tire: OPEN
WKA bodywork rules - CIK
CKRA reserves the right to make adjustments to class specs in the interest of maintaining equality.

NOVICE GROUP(S)

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.
The group can be comprised of 2-Cycle and 206 drivers of the same age group.
Finishing position will be as if they finished at the tail end of the appropriate class.
- 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.
This concept can be applied to any class if the number of entries warrant its use.

BRIGGS 206 SENIOR

ages 15 and up
Engine: Briggs Racing 206
Exhaust: RLV pipe (#5506, #5507)
Weight
- Option One - Minimum 345 lbs. - must use Green coil
- Option Two - Minimum 385 lbs. - can use optional Blue coil from Briggs Racing
  - Maximum kart only weight (without driver) for Blue coil is 200 lbs.
Spec Tire: OPEN
WKA bodywork rules - Gold Cup or CIK
CKRA reserves the right to make adjustments to class specs in the interest of maintaining equality.