250cc 2-Stroke

1. Single cylinder, two-cycle, single carburetor motorcycle dirt bike engine not to exceed 265cc displacement. Stock OEM Stroke. No slipper clutches. 2. Must run gas only. Race gas is OK. No fuel additives or alcohol. 3. Weight with driver shall be a minimum of 420 pounds. 4 Age 13 and up, younger drivers may petition to enter the class. It will be on an individual basis, with track promoter making final decision, based on experience and ability. 5. All racers must run a speced right rear tire. Racers have the option of running Burris 50, Burris QRC55, Hoosier D50, or Rocketboy 50 right rear tires. Right rear tires must punch 50 or above on a durometer. 6. No preping, siping, grinding or doping the right rear ‘speced’ tire.

250F 4-Stroke

1. No overbore, some manufacturers have different cylinders A,B,C etc. As long as it falls within the parameters of OEM specs you are ok. 2. Stock stroke 3. No slipper clutches 4. Carb. or fuel injected is legal, single carb only 5. No porting, no welding of ports, no port angle changes, etc. 6. No lightening of flywheels 7. Must run gas only. Race gas is OK. No fuel additives or alcohol. 8. Any pipe allowed as long as it is not a safety issue, (protruding outside of nerf bars etc.) 9. Gear removal will be a non-tech item 10. Beadlock required on right rear 11. Weight 420 lbs. 12. Age 13 and up. Younger drivers may petition to enter the class. It will be on an individual basis, with track promoter making final decision, based on experience and ability. 13. All racers must run a speced right rear tire. Racers have the option of running Burris 50, Burris QRC55, Hoosier D50, or Rocketboy 50 right rear tires. Right rear tires must punch 50 or above on a durometer. 14. No preping, siping, grinding or doping the right rear ‘speced’ tire.
TEXAS KART NATIONALS

250cc 2-Stroke

1. Single cylinder, two-cycle, single carburetor motorcycle dirt bike engine not to exceed 265cc displacement. Stock OEM Stroke. No slipper clutches. 2. Must run gas only. Race gas is OK. No fuel additives or alcohol. 3. Weight with driver shall be a minimum of 420 pounds. 4 Age 13 and up, younger drivers may petition to enter the class. It will be on an individual basis, with track promoter making final decision, based on experience and ability. 5. All racers must run a speced right rear tire. Racers have the option of running Burris 50, Burris QRC55, Hoosier D50, or Rocketboy 50 right rear tires. Right rear tires must punch 50 or above on a durometer. 6. No preping, siping, grinding or doping the right rear ‘speced’ tire.

250F 4-Stroke

1. No overbore, some manufacturers have different cylinders A,B,C etc. As long as it falls within the parameters of OEM specs you are ok. 2. Stock stroke 3. No slipper clutches 4. Carb. or fuel injected is legal, single carb only 5. No porting, no welding of ports, no port angle changes, etc. 6. No lightening of flywheels 7. Must run gas only. Race gas is OK. No fuel additives or alcohol. 8. Any pipe allowed as long as it is not a safety issue, (protruding outside of nerf bars etc.) 9. Gear removal will be a non-tech item 10. Beadlock required on right rear 11. Weight 420 lbs. 12. Age 13 and up. Younger drivers may petition to enter the class. It will be on an individual basis, with track promoter making final decision, based on experience and ability. 13. All racers must run a speced right rear tire. Racers have the option of running Burris 50, Burris QRC55, Hoosier D50, or Rocketboy 50 right rear tires. Right rear tires must punch 50 or above on a durometer. 14. No preping, siping, grinding or doping the right rear ‘speced’ tire.
Texas Kart Nationals