31.7. Reinforcement plates are mandatory for the attachment of the ballast to the seat. These plates must have a minimum thickness of 1mm and a minimum diameter of 20mm.
31.8. No solid object( excluding jewellery / dog tags) may be carried on the Driver’ s person.
31.9. After a Kart and Driver have competed in any session it is not permissible to alter the weight of the Kart or Driver in any way before being weighed.
31.10. For Classes that include a minimum Driver weight only mandatory items of Personal Protective Equipment( PPE) as required by App. 7 are to be included when the Driver is weighed.
32. Rear Lights on Race Venue Event Gearbox Karts 32.1. A rear-facing high intensity lamp must be fitted.
32.2. It will be permanently illuminated when wet tyres are fitted to the Kart or a Race is designated as a Wet Race or when instructed to do so by the Clerk of the Course.
32.3. Only lamps having a high intensity polarised light source and homologated with the ASN / FIA will be permitted.
32.4. The lens must have a minimum surface area of 280mm2 and the illumination must be visible from a point 45 ° either side of the centre-line.
32.5. The lamp unit must be mounted securely and centrally on the Kart forward of the rear bumper and the whole illuminated area of the light is to be positioned in the area shown in App. 9 Drawing 15 in wet or dry configuration.
32.6. The light must be able to be switched on by the Driver when seated in the normal driving position by means of a switch.
32.7. Karts with lights not switched on when a race is declared wet will not be let out onto the circuit from the Assembly Area or Pit Lane.
33. Engines and Transmissions
33.1. The Scrutineer must be satisfied that the engine transmission exhaust system and all associated parts are installed in an appropriate manner and will perform safely and present no undue hazard to the Driver or other Competitors.
33.2. Where hand-throttle systems are fitted to assist push starts these should be maintained in a clean and failsafe condition.
34. Engine 34.1. The engine / motor must be the sole propelling unit of a Kart in running order.
34.2. Unless the Official Documents state otherwise only engines readily available through normal commercial channels may be used.
34.3. Forced induction in any form is not permitted. 34.4. Power valves are allowed subject to Class Regulations. 34.5. All electronic / microchip methods of operation are forbidden.
34.6. Unless Class Regulations permit any form of manually operated or variable ignition( advancing or retarding systems) is forbidden.
34.7. Unless Class Regulations permit the use of programmable electronic engine management systems which can be varied whilst the Kart is in motion is also forbidden.
34.8. Engines must be fitted with effective radio interference suppressors. 34.9. Only sealed leak proof batteries are permitted. 34.10. Proprietary lead acid batteries sealed for life properly mounted and protected are acceptable.
Motorsport UK National Competition Rules 2026 Edition 1
Chapter 18 Appendix 8- General Technical Regulations 680