11. Pedals 11.1. The pedals must never protrude forward of the Chassis Frame or bumper. 11.2. The accelerator must be operated by a pedal equipped with a return spring.
11.3. Any device linking the accelerator and brake pedals such that either of them may be prevented from being independently depressed partially or fully is prohibited.
11.4. For Karts in Race Venue Event specification the brake pedal and all the parts operating the master cylinders must be made of steel and must be strong enough to withstand the forces applied.
12. Exhausts 12.1. The exhaust system must exit behind the Driver and must not exceed a height of 450mm.
12.2. The terminal part of the silencer must not cross the quadrilateral formed by the outside of the wheels and the front and rear bumpers and must not present a hazard.
12.3. The Kart must have protection to prevent any contact between the exhaust system and the Driver when seated in the normal driving position.
12.4. Unless specifically authorised in Class Regulations exhaust lengths may not be varied whilst the Kart is in motion. Any such system must be failsafe in operation not present a hazard and incorporate a measurable reduction in sound level.
12.5. Intake and exhaust silencing is mandatory. 12.6. Engines must be prepared and equipped to meet or better noise level requirements.
12.7. Event Organisers and venue operators may impose more strict levels according to their own environmental requirements. Such additional restrictions must be published in the Official Documents and be approved by the ASN.
12.8. The requirements for noise control Officials( Environmental Scrutineers) are detailed in Ch. 5 Part A App. 6 Art. 6.
13. Noise Testing
13.1. Effective exhaust and induction muffling is mandatory on all Karts so that noise level regulations are complied with.
13.2. The responsibility rests with the Competitor to comply with the noise regulations. 13.3. Scrutineers will check all intake and exhaust silencers for professional construction and secure fixing. 13.4. Any Competitor losing a silencer during a race will be immediately shown a black Signal.
13.5. Intake silencers sealed to the carburettor intake so that all air entering the carburettor passes through the intake silencer are mandatory for all Classes.
13.6. Details of specific silencing requirements and of approved silencers are given in the Kart Yearbook.
13.7. In all classes all air entering the intake silencer must do so without the addition or proximity of any device that may direct an increased flow of air from the forward movement of the Kart towards the inlet.
13.8. The use of acoustic measures such as inserts between head and cylinder fins to reduce noise in air cooled classes is permitted unless prohibited by Class Regulations.
13.9. Noise testing must be carried out at all Kart Race Events using equipment equal to or better than the minimum requirements of G. 7.8 which should be calibrated before use.
13.10. Tests will be conducted using a microphone suspended over the Track above the normal driving line and connected by cable to the Noise level meter.
13.11. The microphone should be positioned on a straight section of the Track at a point where Karts are at maximum power.
Motorsport UK National Competition Rules 2026 Edition 1
Chapter 18 Appendix 8- General Technical Regulations 671