The CIK-FIA KZ2 class has an engine displacement limit of 125 cc.
KZ2 uses a water-cooled, two-stroke engine with a six-speed gearbox. The engine is not simply a small recreational kart motor: it is a tightly regulated competition unit, and both the engine and chassis must meet CIK-FIA homologation requirements. KZ2 is intended for drivers aged 15 and older and is one of the principal international gearbox categories.
The class was formerly known as Intercontinental C, or ICC. The CIK-FIA renamed it KZ2 in January 2007, aligning it with the KZ family of gearbox classes. Although KZ2 engines are limited to 125 cc, their two-stroke design, high operating speed and six gears produce considerably more performance than the displacement alone suggests.
A common mix-up is confusing engine displacement with power output or with the 125 cc label used by other karting classes. KZ2 and KZ share the same basic engine specification, but KZ generally permits more open chassis and brake choices and has a lower minimum combined weight.