2026 Class Structure/Rules

Oval Karts will Follow 2026 NKA General Rule Book Unless Otherwise Noted Below

Tire Rule Maxxis Only (any slick) (unless otherwise noted)

Spec Fuel Location: TBD

Juice Box (Small Track) (Trophy)

• Age: 6 and Under 
• See Additional Rules Below

Kid Kart (Small Track) (Trophy)

• Age:5-7 
• Engine: 50cc Comer Box Stock
• 219 Chain 10 Tooth Driver, 89 Tooth Rear Sprocket 
• Weight: 150 lbs  

Rookie Red Plate (Small Track )(Trophy)

• Age:5-7 
• Engine: NKA Clone .375 Red Plate 
• Pump Gas, No Ethanol 
• Weight: 235 lbs   

Jr. 1 Warm Up and Grand National

• Age: 8-11
• Engine: NKA Clone .425 Green Plate
• Pump Gas, No Ethanol 
• Weight: 270 lbs  

Jr. 2 Warm Up and Grand National 

• Age: 12-15 
• Engine: NKA Clone .550 Blue Plate
• Pump Gas, No Ethanol 
• Weight: 320 lbs  

Baby Blue Champs (Small Track) (Trophy)

Midwest Champ Kart Series Rules Apply

• Age: 4-7 
• Engine: Harbor Freight 79CC Stock Predator
• Stock Exhaust ONLY 
• Clutch: Any shoe style drum clutch 
• Fuel: Pump Gas, No Ethanol 
• Weight: TBD
• Visit MCKS Facebook page for full rule details

Jr. Champ 

Midwest Champ Kart Series Rules Apply

• Age: 8-14 
• Engine: NKA or AKRA Clone .500 Purple Plate
• Open Pipe
• Pump Gas, No Ethanol 
• Open Clutch
• Weight: 320 lbs  
• Visit MCKS Facebook page for full rule details

Champ Warm Up and GN

Midwest Champ Kart Series Rules Apply

• Age: 15+ 
• Engine: NKA or AKRA Clone or Briggs LO206 
• Pump Gas, No Ethanol 
• Weight: 425 lbs. Clone and 410 lbs. 206
• Open Clutch 
• Visit MCKS Facebook page for full rule details

Semi Pro Clone

• Age: 15+ 
• Engine: NKA Clone 
• Pump Gas, No Ethanol 
• Weight: 380 lbs   
• Cannot enter ANY Grand National Class if entering semi pro, entry subject to officials discretion,  
• Drivers cannot enter if they have any major series win, or race wins over $500 

Clone Super Heavy

• Age: 15+ 
• Engine: NKA Clone 
• Pump Gas, No Ethanol 
• Weight: 425 lbs. Driver Weight 200 lbs. min with Gear (subject to inspection)

Clone Warm Up and Grand National

• Age: 15+ 
• Engine: NKA Clone 
• Pump gas, No Ethanol 
• Weight: 380 lbs  

KT100 Warm Up and Grand National 

• Age: 15+ 
• Engine: Yamaha KT100
• Weight: 370 lbs  Oval Karts

(Trophy)

Age: 15+

All karts running Clone engines must follow NKA Clone Stock engine rules!
Briggs 206’s must be sealed and meet national 206 rules.

All karts must meet NKA safety guidelines — No Exceptions!

Any protests will be checked for legality!

As most of you know, we have been running Clones, Predator 212s, and 206’s together in the same class and have come up with a set of rules to keep them on the same level. The rules for Predator engines are intended to keep them competitive with the NKA clones and have shown that either engine combination can win.

(All engines must be factory stock unless noted)

• Header may be used, but must have an RLV B91 or 4104 silencer.
• Aftermarket air filter and cup may be used.
• ARC or PVL flywheel may be used but must be no less than 3.4 lbs.
• 10.8 lb valve springs (green).
• No machining or porting of heads or block.
• OEM cam only! (I will check if needed!)
• No swapping Hemi / Non‑Hemi parts.
• No billet connecting rods.

• Slicks only
• Pump gas only — no alcohol/ethanol.
• No aggressive driving! (Bumping happens, but we all know the difference!)
• Have good sportsmanship! (It’s go‑karts, not NASCAR.)
• Have fun!!!!

• Predator 212:
  • 330 lbs (shoe clutch)
  • 350 lbs (disc clutch)
• Clones & 206’s:
  • 350 lbs (shoe clutch)
  • 370 lbs (disc clutch)

1. Ages 6 and under (as of January 1, 2026)

2. Stock Radio Flyer Ultimate Go‑Kart 24V Only

3. Must be original equipment from the manufacturer. NO MODIFICATIONS!!!

4. Plastic tires from manufacturer only; no cutting, grooving or adding chemicals of any kind. (Must have original seam)

5. Helmets required. (Bike helmet is sufficient, race helmet is encouraged)

6. Closed‑toe shoes required

7. Long sleeves and long pants recommended but not required

8. One (1) parent on the track infield (only to set driver up)

9. You must change the stock number “7” to your favorite number.

This will help each kid stand out and make it easier to score.

10. This division is for the kids that are still standing on the fence to have a chance to be part of our racing program.

11. A child may run this division until they start racing in a kart class. They may not run both.

12. Any infractions of the rules will result in a ban from the class (This would be a fault of the parent, not the child)

Radio Flyer Ultimate Go‑Karts can be purchased on Amazon, Walmart, and the Radio Flyer website.

Classes and Rules Subject to Change

Updated 3/1/26