Formula 125 ICC

This class mimics the CIK ICC class but with some relaxations to permit existing National engines to be used by replacing the cylinder head and carburettor on older engines, and permits British style karts in the ICC category. Engine regulations have been brought into tighter conformity to CIK ICC from 2005 e.g. port heights. Karts conforming to 125 ICC (UK) technical regulations may race in 125 Open at their class weight of 180kgs. These long circuit regulations are for all intentional purposes the same as those on short circuit. The only exception is where mandatory long circuit rules prevail such as leathers, pegged rear tyres and rear hazard lights.

Chassis:

Any chassis complying with MSA regulations for gearbox karts. All chassis main parts must be firmly secured together on the chassis frame. Flexible connections are only authorised for the conventional steering knuckle support, and for the steering system . All other devices with the function of one, two or three dimensional joints are forbidden. The chassis frame is the central and main supporting element of the entire vehicle. It must have the necessary strength in order to be able to absorb the loads which are produced when the vehicle is in motion. Any hydraulic, pneumatic or elastomeric elements for damping chassis oscillation are forbidden.

Bodywork:

Sidepods, front fairing and front Nassau panel to MSA Competitors Yearbook regulations are required to be fitted at all times. Only short circuit bodywork configuration as detailed above in regulation T6.2 is permitted in this class. Wedge shaped front fairings are not permitted. A bubble conforming to MSA Blue Book Section N.14 and figure N7 is permitted as an alternative to a Nassau panel.

Engine:

Any water cooled single circuit* single cylinder reed valve engine homologated by the CIK for the ICC class with the exception that pre- 2004 engines may be a variant with a cassette gearbox, or may have been homologated for Formula C (reed valve only) or registered with the MSA in Appendix 2 of the MSA Kart Race Yearbook. Maximum cylinder cubic capacity 125cc.

*An additional inner circuit for the normal functioning of a thermostat is allowed The original parts of the homologated engine must always comply with and be similar to the photographs, drawings and physical heights described on the homologation form.

Tuning Regulations:

All Modifications to the homologated engine are allowed, except :
(a) Inside the engine

• Stroke

• Bore (outside maximum limits)

• Connecting rod centre line

• Number of transfer ducts and inlet ports in the cylinder and crankcase

• Number of exhaust ports and ducts. The creation of new exhaust ducts and ports is forbidden

• The total exhaust opening is 199 degrees maximum as per CIK ICC and Super ICC regulations.

(b) Outside the engines

• Number of carburettors (1 only) and diameter of choke

• External characteristics of the fitted engine, except for machining necessary for the application of bar code stickers (via homologation extension)

c) The reed-valve block (dimensions and drawing) must be according to the homologation form. Reed-valve box cover is free. Reed petals may be varied so long as they fit the manufacturer’s reed block.
d) Modifications of external appearance of the engine does not include the fixations of the carburettor, of the ignition, of the exhaust, of the clutch or of the engine itself, providing that their homologation position is not modified.
e) Ignition systems must be CIK homologated for the class
f) Cylinder head volume must be a minimum of 13cc using the CIK specification plug insert and measured as per CIK method described in the CIK annuaire Appendix 1. Ambient temperature is defined as any temperature between -5 degrees C and + 50 degrees C. Spark plugs are free but must be un-modified and the thread must not protrude into the combustion chamber when fully tightened. Modification to the spark plug thread is not permitted except for helicoil repair so long as the repair is to the full depth of the thread.
g) All systems of injection and/or spraying of products other than permitted fuel are forbidden
h) It is permitted to add a mass to the ignition rotor : it shall be fixed by at least 2 screws, without any modification to the homologated rotor.

Silencing:

See regulations T1.1 to 1.10 above. Note that Motivation Design and development intake boxes D&D are not permitted from 1.4.05. Homologated exhaust is not mandatory, the magnetic steel sheet metal thickness must be 0.75mm minimum.

Carburettor:

Carburettor made of aluminium, with a venturi type diffuser with a maximum diameter of 30mm round. The carburettor must be the Del`orto VHSH 30 (CS) or (BS) Code 9303. The carburettor must remain strictly original. The only settings allowed may be made to: the slide, the needle, the floats, the float chamber, the needle shaft (spray), the jets and needle kit, subject to all the interchanged parts being of Dell`orto origin. The incorporated petrol filter and the plate (part no. 28 on the technical drawing No. 7) may be removed, if they are kept, they must be original.

Transmission:

Changes to gear ratios are permitted, except that the number of gears must remain six. Control must remain mechanical, without any servo system or ignition cut system.

Brakes:

Brakes as MSA Blue Book N.14.7

Tyres:

This class is limited to 5” diameter wheels with a maximum tyre width of 7.1”.

Dry Tyres:

Dunlop. Front 10 x 4.5 x 5 SL4 . Rear 11 x 7.1 x 5 SL4

Wet Tyres:

Dunlop KT10. Front 10 x 4.50 x 5, Rear 11 x 6.50 x 5.

Retail Price:

All engines must be available complete with ignition (excluding carburettor, engine mount, silencer and exhaust) for not more than £1950 plus VAT in the same form as homologated.

Weight:

Minimum 180kgs Short Circuit trim. This weight applies to both Short Circuit and Long Circuit Racing

Plates:

Green number plates with white numbers.

 

Age:

The class is open to any driver aged 16 or over on long or short circuits. Novice drivers are permitted on both long (closed to club and National B events only) and short circuits.