Midwest Pavement Grand Nationals Class Structure

2025 Class Structure/Rules

Oval Karts will Follow 2025 NKA General Rule Book Unless Otherwise Noted Below

NKA or AKRA Clone Engine Rules, Must Declare in Tech

Oval Karts will have a Maxxis Only Tire Rule (unless otherwise noted)

ALL 206 Sprint Classes will Follow 2025 Briggs Rules 

Oval Classes

Kid Kart (Small Temp Track)

• Age:4-7 
• Engine: 50cc Comer Box Stock
• 219 Chain 10 Tooth Driver, 89 Tooth Rear Sprocket 
• Weight: 150 lbs  

Rookie Red Plate (Small Temp Track)

• Age:4-7 
• Engine: Clone .375 Red Plate 
• Small Pipe/Weiner Pipe only
• Pump Gas, No Ethanol 
• Weight: 235 lbs   
• 
  

Jr. 1 Warm Up and Grand National

• Age: 8-11
• Engine: Clone .425 Green Plate
• Small Pipe/Weiner Pipe only
• Pump Gas, No Ethanol 
• Weight: 270 lbs  

Jr. 2 Warm Up and Grand National 

• Age: 12-15 
• Engine: Clone .500 Purple Plate
• Small Pipe/Weiner Pipe only
• Pump Gas, No Ethanol 
• Weight: 320 lbs  

Baby Blue Champs (Small Temp Track)

• 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 www.midestchampkarts.com for full rule details

Jr. Champ 

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

Semi Pro Clone

• Age: 15+ 
• Engine: Clone 
• Pump Gas, No Ethanol 
• Weight: 370 lbs  
• Cannot enter Grand National Clone Class if entering semi pro, entry subject to officials discretion 

Clone Super Heavy

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

KT100 Warm Up and Grand National 

(Oval)

• Age: 15+ 
• Engine: Yamaha KT100
• Weight: 370 lbs  Oval Karts
• Weight: 350 lbs  Sprint Karts (CIK Bodywork)

Sprint Classes

Sprint Karts will follow 2025 NKA Sprint

Ignite Class with follow 2025 Ignite Rules

ALL 206 classes will follow 2025 Briggs Rules 

Jr. 1 206 (Sprint)

• Age: 7-11 years old
• Engine: Stock Briggs & Stratton LO 206 with Green Slide and Lock Cap
• Fuel: 87 Octane, No Ethanol 
• Minimum Weight: 265 lbs.
• Tires: Hoosier R60B and Vega Red
• 10x4.5-5 front and rear
• 5” Wheel Diameter  
• Bodywork: CIK Plastics 

Jr. 2 206 (Sprint)

• Age: 12-15 years old
• Engine: Stock Briggs & Stratton LO206 with Yellow slide and lock cap
• Fuel: 87 Octane, No Ethanol 
• Minimum Weight: 320 lbs. 
• Tires: Hoosier R60B and Vega Red
• 5” Wheel Diameter 
• Bodywork: CIK Plastics 

Ignite Jr. (Sprint)

(All Rules Per Ignite Rule Book) 

• Age: 12-15
• Chassis: Ignite K3
• Engine: Briggs LO 206
• Slide: Yellow (#555741)
• Front Sprocket: 15
• Minimum Weight: 320 lbs. 
• Tires: Hoosier 4.5/6.0 R80
• Bodywork: CIK Plastics 

Sr. 206 (Sprint)

• Age: 15 years old and older 
• Engine: Stock Briggs & Stratton LO 206
• Fuel: 87 Octane, No Ethanol  
• Minimum Weight: 375 lbs. 
• Tires: Hoosier R60B and Vega Red
• 5” Wheel Diameter 
• Bodywork: CIK Plastics 

Grand National 206 (Sprint)

• Age: 15 years old and older 
• Engine: Stock Briggs & Stratton LO 206
• Fuel: 87 Octane, No Ethanol 
• Minimum Weight: 375 lbs. 
• Tires: Hoosier R60B and Vega Red
• 5” Wheel Diameter 
• Bodywork: CIK Plastics 

Ignite Sr. (Sprint)

(All Rules Per Ignite Rule Book) 

• Age: 15 years old and older 
• Chassis: Ignite K3
• Engine: Briggs LO 206
• Slide: Black (#302328)
• Front Sprocket: 15
• Minimum Weight: 360 lbs. 
• Tires: Hoosier 4.5/7.1 R80
• Bodywork: CIK Plastics 

Open Shifter Karts (Sprint) TENTATIVE Class Subject to Change

• Age: 15 years old and older 
• Engine/Weights: 
  • Stock Honda 125 / 375 lbs
  • Mod Honda 125 / 385 lbs
  • ROK 125 / 385 lbs
  • KZ125 / 395 lbs
  • IAME 175 / 400 lbs
• Tires: Hoosier R55 and MG Yellow 
• Bodywork: CIK Plastics 

Classes and Rules Subject to Change

Updated 1/13/25