C1.0 Group Senior (Direct Drive)
C1.1 Class Formula 100cc
C1.2 Affiliation Hoddesdon Kart Club
C1.3 Introduction. A class is in the spirit of the ABkC's Formula Libre regulations which accommodated 100cc classes in 2006. Formula 100cc is not intended to be raced on a national level, but is designed to celebrate the heritage and beauty of British 100cc karting. All Formula 100cc equipment must conform to MSA chassis and MSA silencing regulations.
C1.4 Chassis. Any chassis conforming to MSA Competitors’ and Officials’ Yearbook
C1.5 Bodywork. In accordance with MSA and ABkC regulations for direct drive.
C1.6 Engines. Single cylinder air or water cooled engine without gearbox, maximum capacity 100cc, rotary or reed-valve intake, that has been homologated or registered by the CIK, CIK, RAC or the MSA or MSA registered liquid cooled equivalents. Tuning limitations are:
a) no form of variable ignition that may be adjusted whilst the kart is in motion.
b) modifications to the engine are allowed provided that the following are not varied.
ii. Bore (outside a maximum giving swept volume of 100cc).
iii. Connecting rod centre length (magnetic material obligatory).
ii. Modification of the external appearance of the engine, this does not include carburettor, ignition, exhaust or engine fixings, provided the homologated or registered position is not modified. Minor damage is to be ignored e.g., broken fins.
All systems of injection and/or spraying of products other than permitted fuel are forbidden. Supercharging or turbocharging is forbidden.
C1.7 Exhaust. Exhaust systems are free provided that they conform to the current MSA and ABkC technical and noise regulations.
C1.8 Carburettor. A single butterfly carburettor with centre axle and a maximum venturi diameter of 24mm for a minimum distance of 2mm including tolerance.
C1.9 Transmission. The drive must be by a single chain connecting the engine drive sprocket to the rear axle sprocket.
C1.10 CIK type, minimum volume 1000cc.
C1.10.1 Made from flexible, non-splinterable plastic (non metallic).
C1.10.2 Air intake orifice maximum of 2 openings, form optional, maximum diameter 23mm.
C1.10.3 Mounted airtight to the carburettor, mounting method free.
C1.11 Brakes. Must be hydraulic operating on the rear wheels only.
C1.12 Tyres. The only slick tyres permitted are the new age TKM Maxxis green label tyres which were made available 1.1.2010 . Dry slick tyres will have green labels, wet tyres will have red labels with TKM stamp. They must not be modified in any way including hand or machine cutting Old style Maxxis SLC Green Label tyres may NOT be used.
Tyre sizes/types as follows:
Dry – Maxxis Green Label - Front 10x4.50-5, Rear 11x7.10-5
Wet - Maxxis Red Label – Front 10x4.50-5, Rear 11x6.00-5
C1.13 Weights. Minimum weight including driver at all times must be 150kg
C1.14 Plates. Yellow number plates with black numbers.
C1.15 Age. The Class is open to any driver aged 16 or over. A Junior may transfer to this senior class at any time during the year that he/she achieves their sixteenth birthday. Having moved into the senior class he/she may not revert to a junior class.
Refer to Appendix 3 of the Kart Race Year Book (Gold Book) for Exhaust and Silencer regulation