The main regulations for all motorsport in the UK is found in the MSA Yearbook, including the Kart Section U. There are important sections for licencing, judicial and safety which apply to kart racing. Click here for the whole 2018 book, and here for just 2018 Section U
Amendment to 2017 Yearbook, click on this – issued 20.12.16
The regulations for the core classes are found in the MSA Kart Race Yearbook. Click here for a copy of the 2018 Kart Race Yearbook (known as the Gold Book)
Amendments to the 2017 Kart Race Yearbook (now out of date):
Amendment 4 – Cadet Front Fairing/Bumper (Amended 4 January 2017)
The KG Cadet rear plastic bumper is now approved for use, see here.
Smaller or new classes, or variations to the major classes, will have their own set of regulations, usually by way of a KTE (Kart Technical Exemption).
Here are some of the popular 2017 KTE’s (2018 versions awaited):
X30 Mini (new for 2017 – amended 13 March to allow use of Shell M)
210 National Note this was amended 23.05.17 to include a replacement K&N air filter
Clubs can also offer the Clubman classes (which are lower powered and do not need the driver to take the ARKS Test so Clubman licence is required and can be taken out on the day of the race if necessary) or Libre classes (which do need the ARKS Test). Between them they cater for engines which are no longer homologated with their own class structure, or clubs wishing to combine a class with several compatible engines or use an engine that may not be in the regular homologated class approvals. The MSA is open to new approvals for Clubman or Libre.
Here are some of the more popular KTE Approvals for 2016 (all available on MSA)
125 Open (awaiting 2017/18 update)
Honda Junior / Honda Senior / World Formula
X30 Junior and Senior
450 Gearbox 2016-303
All of the above regulations can be found on the MSA Website: Kart Technical Documents. This page also includes lists of MSA homologated or registered equipment and relevant fiche. Note the Fiche for Rotax and TKM were amended during January 2015
2018 Honda Technical Regulations V13 (MSA approved 14.11.17), this comes into force on 31.3.2018
2016 Honda Technical Regulations V11a (MSA approved 23.5.16 for immediate implementation for the clarifications listed) and this version is needed for those with T1 engines.
International Regulations and lists of homologated equipment, including racewear, can be found on the CIK Website
Homologations are a method of certifying certain equipment, and are usually valid for a certain number of years, with regular dates (often every three years) for new applications. This method means that the sport has stability as equipment cannot be updated at a whim by the suppliers. The fiche is the technical document describing the equipment in often great detail. Competitors should have copies of the homologations and fiche for the equipment they are using.
Club regulations (supplementary regulations or championships regulations) must be approved by the MSA and must reference which classes are being offered and where the regulations for these classes can be found. Clubs usually put their local regulations on their website, see club listing. The championship regulations will also show how points and penalties are calculated.
AMENDMENTS: This page will also contain important amendments issued during the year:
2016 Amendments and Bulletins:
Honda Cadet ABKC Bulletin No 3 (Exhaust) – now superseded by No 4
Class Regulations and Fiche for OK/OKJ
The class regulations are available here: https://www.msauk.org/assets/3-06.04.16.pdf
The engine fiche and MSA amendment appendix were updated on 4 August 2016 and are available on this MSA page here
Clarification on TKM BT82 Piston Rings issued January 2015
Summary of Main Kart Classes for 2017
|Class||Number Plate/No.||Weight kg (with driver)||Ages||Tyres – Dry||Tyres – Wet||Comments|
|Bambino||White/Black||69||6-8||Le Cont MSA04||Le Cont MSA04||Comer C50 MSA homologated 2-stroke engine|
|IAME Cadet||Yellow/Black||103||8-13||Dunlop LS2 MSA||KT3 ‘RAC’||60cc Parilla Gazelle un-sealed engine, clutch, pull starter|
|Honda Cadet||Yellow/Red||103||8-13||Dunlop LS2 MSA||KT3 ‘RAC’||GX160 4-stroke budget engine, clutch, pull starter|
|Junior TKM 2S||Blue/White||From 123||11-17||Maxxis TKM Green||F TKM||As TKM with restrictor, optional clutch, optional TAG|
|MiniMax||Yellow/Black||135||11-15||Mojo D1 Yellow||Mojo W2 CIK||Restricted version of Rotax Junior Max|
|Junior Max||Red/White||148||13-17#||Mojo D2||Mojo W2 CIK||Junior version of Rotax Senior Max|
|X30 Mini||White/Black||136||12thyr-17||Komet K1H||Komet K1W||Restricted version of X30 Junior|
|X30 Junior||Green/White||148||13-17#||Komet K1H||Komet K1W||Junior version of X30 with restrictor|
|OK Junior||Yellow/Black||142||13-17#||Vega XH CIK||Vega W5 CIK||Junior version of OK, these are push start karts|
|TKM 2S Extreme||Red/White||From 132||16||Maxxis TKM Green||F TKM||115cc BT82, optional clutch, optional TAG|
|Rotax Max||Blue/White||162||16||Mojo D2||Mojo W2 CIK||125cc d/drive commercial TAG class (electric start)|
|Rotax Max/177||Green/White||177||16||Mojo D2||Mojo W2 CIK||Heavy-w’t version with 80kg min driver weight|
|X30 Senior||Yellow/Black||164||16||Komet K1H||Komet K1W||Commercial TAG 125cc IAME engine, not sealed|
|OK Senior||Yellow/Black||152||16||Vega XM CIK||Vega W5 CIK||International & British Championship (Vortex engine)|
|Formula Libre & Clubman||Various||16||Various||Various||Catering for obsolete or minority classes such as Honda Junior and Senior, World Formula and older engines|
|KZ2||Yellow/Black||175||16||Dunlop DFH||KT14||International & British Championship 125cc gearbox class|
|KZ UK||Green/White||180||16||Dunlop DFH||KT14||125cc reed valve 6 gears with 30mm carburettor|
|250 National||White/Black||195/200*||16+||Dunlop, Le Cont , Vega all CIKOption||Same makes as Dry||Motocross 250cc single cylinder engines, 450 4-stroke and 175 IAME 2-stroke options, 125 Open may race in this class|
Key: + means 17 years minimum for long circuit racing. 2S: 2-stroke engine; 4S: 4-stroke engine (Classes are 2S unless otherwise shown)
Many class regulations call for specific tyre markings on the tyres e.g. ABKC, JAG, MSA, GB etc, See Kart Race Yearbook.
Junior classes have a minimum driver weight, for safety reasons. Junior TKM 38kg & MiniMax 39, Junior Max, 42.5,
Junior Max may race in year of 13th birthday for experienced drivers
*250/210 Gearbox has two weights, one when short circuit or no bodywork is fitted, the heavier for when wings or long circuit bodywork is fitted.