KZ2 is a kart racing class using 125 cc water-cooled two-stroke engines yielding about 45 hp, equipped with a 6-speed gearbox. Technical regulations are similar to KZ1 except for the gearbox which must be "hand-operated and exclusively mechanical without a servo system", and the use of medium tires. Both engines and chassis must be approved by the CIK-FIA racing governing commission. It is open to drivers aged 15 and up. Minimum weight is 175 kg with driver.
This class used to be called Intercontinental C (ICC) and was renamed by the CIK-FIA in January 2007.
The class is run in national and continental championships and is popular in Europe and the USA. In the UK the Northan Karting Federation (NKF) run the ABkC British gearbox championships called Super 4. In the UK for 2014, dunlop DFH's are the regulated tyres.