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KZ1 is a kart racing class using 125 cc water-cooled two-stroke engines yielding approximately 46–50 hp (34–37 kW), equipped with a six-speed gearbox. KZ1 is the fastest of the KZ karting racing categories, and technical regulations are similar to KZ2 except that KZ1 allows for the gearbox to be either manual or electro-mechanical as well as the wise use of soft tires.  Both engines and chassis must be approved by the CIK-FIA racing governing commission. It is open to top drivers aged 15 and over. Minimum weight is 170 kg (370 lb), this includes the kart and driver. They can accelerate from 0-100 km/h in 3 seconds. KZ1 has a top speed of 180 km/h (110 mph).
This class used to be called Formula C. It was discontinued in favor of Super ICC and renamed KZ1 by the CIK-FIA in January 2007.
There is a European KZ1 Championship and a World Cup, both organized under CIK-FIA.
|Year||World Champion||Chassis / Engine / Tire||Class|
|1983||Gianni Mazzola||Birel / Balen / Dunlop||Formula C|
|1984||Gabriele Tarquini||Kalì / Balen / Dunlop||Formula C|
|1985||Piermario Cantoni||Kalì / Balen / Dunlop||Formula C|
|1986||Fabrizio Giovanardi||Tony Kart / Pavesi / Bridgestone||Formula C|
|1987||Alessandro Piccini||DAP / Pavesi / Vega||Formula C|
|1988||Peter Rydell||All Kart / Pavesi / Dunlop||Formula C|
|1989||Gianluca Giorgi||Kalì / Kalì / Dunlop||Formula C|
|1990||Alessandro Piccini||Birel / Pavesi / Bridgestone||Formula C|
|1991||Alessandro Piccini||Birel / Pavesi / Dunlop||Formula C|
|1992||Danilo Rossi||Kalì / Pavesi / Dunlop||Formula C|
|1993||Alessandro Piccini||Kalì / Pavesi / Dunlop||Formula C|
|1994||Jarno Trulli||Tony Kart / Pavesi / Dunlop||Formula C|
|1995||Gianluca Beggio||Biesse / TM / Vega||Formula C|
|1996||Gianluca Beggio||Biesse / TM / Bridgestone||Formula C|
|1997||Gianluca Beggio||Birel / TM / Bridgestone||Formula C|
|1998||Gianluca Beggio||Birel / TM / Bridgestone||Formula C|
|1999||Francesco Laudato||Birel / TM / Dunlop||Formula C|
|2000||Gianluca Beggio||Birel / TM / Bridgestone||Formula C|
|2003*||Robert Dirks||Birel / TM / Vega||Super ICC|
|2004*||Ennio Gandolfi||Birel / TM / Vega||Super ICC|
|2005*||Francesco Laudato||Birel / TM / Vega||Super ICC|
|2006*||Davide Forè||Tony Kart / Vortex / Vega||Super ICC|
|2007*||Jonathan Thonon||CRG / Maxter / Dunlop||KZ1|
|2008*||Jonathan Thonon||CRG / Maxter / Dunlop||KZ1|
|2009*||Jonathan Thonon||CRG / Maxter / Dunlop||KZ1|
|2010*||Bas Lammers||Intrepid / TM / Dunlop||KZ1|
|2011*||Jonathan Thonon||CRG / Maxter / Dunlop||KZ1|
|2012*||Bas Lammers||Praga / Parilla / Bridgestone||KZ1|
|2013||Max Verstappen||CRG / TM / Bridgestone||KZ|
|2014||Marco Ardigo||Tony Kart / Vortex / Bridgestone||KZ|
|2015||Jorrit Pex||CRG / TM / Bridgestone||KZ|
|2016||Paolo de Conto||CRG / TM / Vega||KZ|
|2017||Paolo de Conto||CRG / TM / Vega||KZ|
|2018||Patrik Hajek||Kosmic / Vortex / LeCont||KZ|
|2019||Marijn Kremers||Birel / TM / Bridgestone||KZ|
|2020||Jérémy Iglesias||Formula K / TM / Vega||KZ|
* indicate World Cup, which replaced the World Championship from 2000-2012
|1974||Aad van Daalen||Landia||Yamaha||Formula C - 125cc|
|1975||Ben van Velzen||Mach 1||Yamaha||Formula C - 125cc|
|1976||Gianfranco Baroni||All Kart||BMC||Formula C - 125cc|
|1977||Gianfranco Baroni||All Kart||BMC||Formula C - 125cc|
|1978||Gianfranco Baroni||All Kart||BMC||Formula C - 125cc|
|1979||Giancarlo Vanaria||Kali Kart||Rotax||B||Formula C - 125cc|
|1980||Gianfranco Baroni||Birel||BMC||Formula C - 125cc|
|1981||Gianfranco Baroni||Birel||BMC||Formula C - 125cc|
|1982||Alessandro Piccini||Allkart||Morbidelli||Formula C - 125cc|
|1982||Peter De Bruijn||Tecno Kart||Parilla||Formula K|
|1983||Mike Wilson||Birel||Parilla||Formula K|
|1984||Mike Wilson||Birel||Parilla||Formula K|
|1985||Stefan Frietsch||Kali Kart||Komet||Formula K|
|1986||Yvan Muller||Kali Kart||Komet||Formula K|
|1987||Alex Zanardi||Kali Kart||Komet||Formula K|
|1988||Federico Gemmo||Tecno Kart||Komet||Formula K|
|1989||Marc Goossens||Tecno Kart||Komet||Formula K|
|1990||Martijn Koene||Swiss Hutless||Rotax||Formula K|
|1991||Massimiliano Orsini||Tony Kart||Rotax||Formula SA|
|1992||Gianluca Beggio||Kali Kart||Rotax||B||Formula K|
|1993||Nicola Gianniberti||Haase||Rotax||D||Formula SA|
|1994||Jarno Trulli||Tony Kart||Rotax||B||Formula SA|
|1995||Massimiliano Orsini||Swiss Hutless||Italsistem||B||Formula SA|
|1996||Jonny Mislijevic||Tony Kart||Vortex||B||Formula SA|
|1996||Alessandro Piccini||CRG||Pavesi||B||Formula C|
|1997||Jenson Button||Tecno Kart||Rotax||B||Formula SA|
|1997||Gianluca Beggio||Birel||TM||B||Formula C|
|1998||Davide Forè||Tony Kart||Rotax||B||Formula SA|
|1998||Gianluca Beggio||Birel||TM||B||Formula C|
|1999||Giuseppe Palmieri||Swiss Hutless||Italsistem||B||Formula SA|
|1999||Ronnie Quintarelli||Tony Kart||Vortex||B||Formula C|
|2000||Mario Siegers||Trulli Kart||Vortex||B||Formula SA|
|2000||Francesco Laudato||Birel||TM||B||Formula C|
|2001||Alessandro Piccini||CRG||TM||B||Formula C|
|2011||Paolo De Conto||Energy Corse||TM||D||KZ1|
|2015||Flavio Camponeschi||Tony Kart||Vortex||B||KZ|
|2016||Marco Ardigò||Tony Kart||TM||Vega||KZ|
|2017||Paolo De Conto||CRG||TM||B||KZ|
|2019||Jorrit Pex||Kart Republic||TM||B||KZ|
|2020||Marijn Kremers||Riccardo Kart||TM||Vega||KZ|
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