Appendix 10- Technical Regulations
12. All Vehicle Types...
12.17. Vehicles in Junior Competitive Safari must be equipped with an internal switch that is capable of isolating all electrical circuits and completely stopping the engine. The operating switch must be positioned so that it can be operated by the Driver and the Navigator when normally seated with seat belts fastened.
Appendix 13- Technical Regulations for Junior Trials Vehicles
1. All Junior Trials Vehicles must either: 1.1. Comply with Arts. 2-11; or
1.2. Be a standard production vehicle of a type approved by the ASN, with no modifications permitted. Vehicles will be listed on ASN Website.
2. Only the following categories of Vehicle are allowed to compete in Junior Trials: 2.1. Standard ASN approved off road Vehicle.
2.2. Two-wheel drive Vehicle adapted from a front-engined lawn or garden tractor with the cutter deck and associated ancillaries removed, and fitted with a four stroke petrol or diesel vertical crankshaft engine of the Industrial and Commercial restricted type.
1.3. Chassis and Body
1.1.3.1 The Chassis and bodywork in Junior Trials Vehicles must be standard except where modified to comply with these Regulations and must be that from a proprietary machine.
1.2.3.2 Ch. 7 App. 7 Art. 1.4 does not apply in respect of the seat cushion being 15.25cm below the adjacent body. 1.3.3.3 App. 10 Art. 1.1 does not apply.
2.4. Engine
2.1.4.1 Vehicles must be fitted with a four-stroke petrol or diesel vertical crankshaft engine of the industrial and commercial restricted type and designed for use on a Ride on Mower or Lawn / Garden Tractor.
2.1.4.2 The engine must be fitted in its original location and retain its governor or restrictor which may not be modified or removed.
2.1.4.3 The engine must be fitted with an air filter the type and location of which is free.
2.1.4.4 The engine must be fitted with an effective silencer such that the Vehicle complies with the Noise limits provided by Ch. 7 App. 8.
2.1.4.5 The silencer and exhaust manifold are free as to type and location but must be fitted with shields when located outside of the bodywork or Chassis.
3.5. Transmission 3.1.5.1. A manual constant mesh transmission must be fitted of the type originally fitted to the Vehicle. 3.2.5.2. Transmissions of an alternative make or model may be fitted. 3.3.5.3. The Driver must be protected from all drive belts / chains. 3.4.5.4. Vehicles must not be fitted with a locked locking or torque-biasing differential.
Motorsport UK National Competition Rules 2026 Edition 5
Chapter 22 Appendix 20- Cross Country( Chapter 20) 856