HONDA CADETS

B1.1 Cadet (general regulations)

UK IKR rules and regulations are always the first point of call on any issues, if this fails to resolve an issue then the MSA Gold Book will be consulted and used as a reference point. 

Competitors should work on the basis that if any process is not clearly stated as being permissible, then they should accept that it is illegal and seek clarification from the Scrutineer.

Karts must comply with these technical regulations at all times during official practice and racing. It is the competitors’ responsibility to ensure that their kart complies.

Technical checks may be carried out before, during and after qualifying and racing. The scrutineers are empowered to undertake any form of verification they deem necessary.

B1.3 Chassis. MSA homologated Cadet chassis only. The chassis must remain as homologated in all respects and may only be subject to MSA approved modifications for safety reasons.

B1.3.1 Modifications. The only additions permitted, along with modifications solely concerned with their fitment are: Seats, Nassau Panels, Front Fairing and Ballast to achieve the required weight or for repair purposes. Any non-homologated part, except as stated above, may not be added. Any additional or alternative welded on components not shown on the MSA chassis homologation are not permitted.

B1.3.2 Prohibited Materials. The following materials are specifically prohibited: Kevlar, carbon fibre (except for seats and floor tray), magnesium and titanium.

B1.3.3 Dimensions.

Wheelbase: 900mm ± 5mm

Overall Length: 1700mm (max.)

Overall Width: Min: 2/3 wheelbase Max: 1200mm

Steering: Camber/caster adjustment is permitted by means of a single, solid eccentric on the top face of each yoke. It is permissible to use up to 2 fixing screws per adjuster to maintain its position. The offset of the king pin from its standard position must not exceed 2mm therefore the diameter of the hole in the yoke may not exceed a size 4mm greater than the king pin.

B1.3.4 Floor Tray. There must be a rigid, flat floor from the seat to the front and side chassis members, secured to them so as to prevent the driver’s feet from sliding off. The rear-most point of the floor tray must not project beyond the middle of the chassis cross rail located under the front of the seat. Any perforation of the floor other than for the attachment of ballast and other applicable accessories must be a production feature and be homologated as such. If perforated, the holes must not have a diameter exceeding 10mm.

B1.3.5 Bodywork and Bumpers. All Cadet karts must be fitted with bumpers and bodywork providing front, rear and side protection, as detailed in the regulations below and in Drawing Number 6 in Section U of the MSA Yearbook. CSAI homologated Minikart bodywork and bumpers may also be used, with the exception of the Rear Protection System, in lieu of regulations 1.3.6, 1.3.8-1.3.11 as relevant and provided that they comply fully with their homologation. An MSA-registered Rear Protection System may be used in lieu of a rear bumper (1.3.7), an up-to-date list of MSA-registered RPS can be found at www.msauk.org/karttech.

B1.3.6 Front Bumper. Must comply with U17.2.1-17.2.3 and the following:

• Have the four attachment points welded to the chassis-frame. For 2011 and later homologated chassis, these points must be as homologated.
• Have the lower and upper tubes joined by a minimum of one aluminium or steel connecting upright.

This requirement does not include over centre clips.

• The lower bar must be constructed from magnetic steel tubing with minimum outside diameter of 18mm and a minimum wall thickness of 1.4mm and comprise a D-shape extension to the chassis frame.

It must be a minimum width of 250mm, and be 80mm ± 30mm above the ground with the kart in dry configuration.

• The upper bar must be constructed from magnetic steel tubing with minimum outside diameter of 15mm and a minimum wall thickness of 1.4mm. It must be a minimum width of 300mm, and be 200mm ± 50mm above the ground with the kart in dry configuration.

B1.3.7 Rear Bumper. Must comply with U17.8.4-17.8.8, and the following:

• Consist of two horizontal tubes. The upper having outer extension forming a closed loop, with two link tubes to the chassis anchorage points (as per Drawing 5, Diagram 2 in Appendix 1 of Section U) at least 450mm apart at any point. The radius of the outer extensions is free but it should not be less than 2.5 times the tube outside diameter.
• Have the upper bar and outer loops constructed from magnetic steel tubing with a minimum outside diameter of 18mm and a minimum wall thickness of 1.4mm.
• Have the lower bar constructed from magnetic steel tubing with a minimum outside diameter of 15mm and a minimum wall thickness of 1.4mm.
• Have the upper tube and uppermost extension element 225mm ± 25mm above the ground in dry configuration.
• Have the lower tube connected between the two uprights and a maximum height of 100mm above the ground in dry configuration and a minimum height level with the centreline of the chassis rail.
• Have the fixings secured at all times. The contact area of the fixing must not protrude inside the rear of the chassis rail by more than 100mm.

B1.3.8 Side Bumpers. The side bumpers must (please note U17.9 does not apply):

• Comprise a minimum of a single tube constructed from magnetic steel tubing with minimum outside diameter of 18mm and a minimum wall thickness of 1.4mm (minimum diameter of 20mm recommended).
• Be securely attached to chassis by a minimum of two points on each side of the chassis.
• Allow for the attachment of the mandatory side pods.
• For pre-2011 homologated chassis, where parallel side bumper mounting points are used, have these points a minimum of 375mm apart (measured at the centres). For 2011 and later homologated chassis, these points must be as homologated.
• Side bumpers must be compatible with existing bodywork and include side support.

B1.3.9 Side Pods. Must comply with U17.10 and the following:

• Include on the outer side a vertical surface with a minimum height of 70mm and a minimum length of 250mm located immediately above the ground clearance.
• Not include holes or cuttings except those necessary for their attachment and those in the inside and top plastic face for fitments (maximum M8 diameter). A hole may also be drilled for starter access, even if not in use.
• Not cover any part of the driver seated in their normal driving position.
• Not be designed to hold back water, gravel or any other substance.
• Have a clearance of between 25mm and 60mm above the ground in dry configuration (see Section U, Drawing 6).

B1.3.10 Front Fairing. Must comply with U17.5.1-17.5.3 and the following:

• Have a width of 850mm ± 150mm.
• Have a front overhang of 500mm maximum.
• Have a clearance of between 25mm and 60mm above the ground in dry configuration (see Section U, Drawing 6).
• Comprise on its front face a centrally located vertical surface minimum 250mm x 70mm.

B1.3.11 Front (Nassau) Panel. Must comply with U17.6.1, 17.6.2, 17.6.4, 17.6.5, and the following:

• Have a maximum width of 300mm.
• Be fixed behind the front bumper and must not protrude past the front face of the front fairing.

B1.3.12 Torsion Bars. Karts homologated with rear torsion bars must be raced with the bars in place and locked at all times. Front and side torsion bars are not permitted.

B1.3.13 Seat. Seat is free. Additional bolt on seat stays/mountings are permitted to a maximum of one per side, position is free. Bolt fixings must be used at each end of the seat stays.

B1.4 Engine. See class specific regulations below.

B1.4.1 Engine Modifications. The use of a single in-line fuel filter is permitted.

B1.5 Transmission. Direct from the engine to the axle via a single length of chain. All methods of chain oiling and greasing while the kart is in motion are forbidden. A guard must be fitted covering the transmission in compliance with MSA Yearbook regulations (see U18.8.4 and U18.8.5).

B1.5.1 Axle. A solid, magnetic parallel bar of 25mm diameter. Split quick release bearing mountings are not permitted. Must be fitted with circlips on the ends of the axle.

B1.6 Brakes. MSA homologated Cadet brake system. Mechanical or hydraulic operation, solid disc, operating on the rear axle only. Interruptions on the friction surface (drilling, slots etc.) are permitted on homologated systems only and must be specified on the homologation form. Radially vented discs are not permitted. The brake linkage must be duplicated.

B1.7 Wheels. Wheels may be of two piece or mono aluminium construction, i.e. spun aluminium, diecast aluminium or sandcast aluminium. Hubs may be separate or integral. In accordance with U16.8.6, any hub with an overall length (excluding wheel studs) of less than 60mm must not overhang the ends of the rear axle, measurement to be taken from the wheel-to-hub mating surface.

B1.7.1 Tyres.

Dry – ‘Dunlop SL3 – msuk’ Front 10 x 3.6 x 5, Rear 11 x 5 x 5. Barcoded. Wet – ‘Dunlop KT3’ Front 10 x 3.6 x 5, Rear 11 x 4.5 x 5. Barcoded.

B1.8 General. The practice of lifting karts on the dummy grid or start line while the engine is running is prohibited.

B1.8.2 Weight. Minimum driver weight as per U17.29.6 is 27kg. See class specific regulations below for minimum class weights.

B1.8.3 Number Plates. See class specific regulations below.

B1.8.4 Age. From the 8th birthday to the 31st December of the year of the 13^th birthday (see U15.1).

B3.0 HONDA CADET SPECIFIC REGULATIONS GX160

B3.1 Chassis Modifications. The floor mounted fuel tank may be removed if the integral Honda fuel tank is retained.

B3.2 Engine. One Honda engine of the ‘GX160T1 QHQ4’, ‘GX160UT1 QHQ4’, ‘QHG4’, ‘GX160UT2QHQ4’ or ‘GX160RT2-QHG4’ designation or as subsequently modified, is to be fitted.

Engine types must comply with the ABkC Honda GX160 technical regulations Version 16 as of 01 January 2021 or as subsequently modified, which are available on the ABkC website Honda_GX160TechRegsV16.pdf (abkc.org.uk)

B3.2.1 Engine Modifications. Only modifications/additions in compliance with the ABkC Honda GX160 Technical Regulations Version 16 as of 01 January 2021 or as subsequently modified are permitted. T1 Engine Regulations are in GX160 Technical Regulations v11a 2016.

As per B1.4.2, a performance restrictor plate of currently 16mm is to be fitted between the carburettor and insulator as per the Honda GX160 Technical Regulations. The restriction may be amended by giving 4 weeks notice of change during the year.

B3.2.2 Fuel. It is not permitted to have any additives or lubricant in the fuel, otherwise as U16.17.

B3.3 Weight. Minimum 103kg, including the driver. Minimum driver weight as per U17.29.6 is 27kg (B1.8.2)

B3.4 Plates. Yellow with red numbers (see U17.27). The numbers must be of the ‘Classic’ type as described in U17.27.3.

HONDA CADET SPECIFIC REGULATIONS GX 200

Engine:

 For GX200 Engine regulations as per RPM specification

All engines are subject to a buy back rule and can be brought for £850.

All engines must be sealed by RPM

Weight. Minimum 105kg, including the driver. Minimum driver weight as per U17.29.6 is 27kg (B1.8.2)

Plates. Yellow with red numbers (see U17.27). The numbers must be of the ‘Classic’ type as described in U17.27.3