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OK-Junior is akart racing class for top drivers between 12 yearsold (reaching their 12th birthday during the calendar year) and14 years of age (reaching their 14th birthday during the calendaryear).
This class used to be calledJunior Intercontinental A (JICA orICA-J) and has changed since January 2007 whenCIK-FIA decided to replace the 100 cc air-cooledtwo-stroke engines with 125 cc Touch-and-Go (TaG) water-cooled two-stroke engines (KF type).The engines produce 26–27 hp (19–20 kW). The chassis and engines must be approved by the CIK-FIA. Minimum weight is 145 kg, including kart and driver.
Karts are equipped with an electric starter and clutch. The enginerpm is limited to 14,000 rpm.
It is one of the highest kart classes with national championships (perhaps with different tyre rules).
There is a European championship, a World Cup, as well as Oceania and Asia-Pacific championships. TheJunior Monaco Kart Cup is taking place each year in this format.
For 2013 the class was renamedKF-Junior.
In 2016, the karts were completely re-designed by removing much of the electronics. The karts are now push started. The class was subsequently renamedOK-Junior, standing forOriginal Kart.
| Year | World Cup Winner[1] | Chassis / Engine / Tires |
|---|---|---|
| 2009 |  Giuliano Niceta | Tony Kart / Vortex / Vega |
| 2010 |  Alexander Albon | Intrepid / TM /Dunlop |
| 2011 |  Charles Leclerc | Intrepid / TM / Vega |
| 2012 | Luca Corberi | Kosmic / Vortex / Vega |
| Year | World Championship Winner[1] | Chassis / Engine / Tires |
|---|---|---|
| 2013 | Alessio Lorandi | Tony Kart / Parilla / LeCont |
| 2014 |  Enaam Ahmed | FA Kart / Vortex / Vega |
| 2015 |  Logan Sargeant | FA Kart / Vortex / LeCont |
| 2016 |  Victor Martins | Kosmic / Parilla / Vega |
| 2017 | Dexter Patterson | Exprit / TM / LeCont |
| 2018 | Victor Bernier | Kosmic / Parilla / Vega |
| 2019 |  Thomas ten Brinke | FA Kart / Vortex / LeCont |
| 2020 | Freddie Slater | Kosmic / Vortex / LeCont |
| 2021 |  Kean Nakamura-Berta | Exprit / TM / MG |
| 2022 | Enzo Tarnvanichkul | Tony Kart / Vortex / Vega |
| 2023 |  Dries van Langendonck | Exprit / TM / Vega |
| 2024 | Kenzo Craigie | KR / IAME / Maxxis |
| 2025 | Noah Baglin | KR / IAME / Maxxis |
| Year | European Champion[1] | Chassis / Engine / Tires |
|---|---|---|
| 1999 |  Reinhard Kofler[2] | Tony Kart / Vortex |
| 2000 |  Michael Ammermüller | Tony Kart / Vortex |
| 2001 | Sebastian Vettel | Tony Kart / Vortex / Vega |
| 2002 |  Sébastien Buemi | CRG / Maxter / Vega |
| 2003 | Nicholas Risitano | Birel / TM / Vega |
| 2004 | Stefano Coletti | Birel / Parilla / Vega |
| 2005 |  Michael Christensen | Gillard / Parilla /Bridgestone |
| 2006 |  Miquel Monrás | Maranello / Parilla / Vega |
| 2007 | Jack Harvey | Maranello / XTR / Dunlop |
| 2008 |  Aaro Vainio | Maranello /Maxter /Dunlop |
| 2009 | Nyck de Vries | Zanardi /Parilla / Vega |
| 2010 | Alexander Albon | Intrepid / TM /Dunlop |
| 2011 | George Russell | Intrepid / TM / Vega |
| 2012 | George Russell | Tony Kart / Vortex / Vega |
| 2013 | Lando Norris | FA Kart / Vortex / LeCont |
| 2014 | Enaam Ahmed | FA Kart / Vortex / Vega |
| 2015 | Brenden Wyer | Tony Kart / Vortex/ LeCont |
| 2016 | Fin Kenneally | FA Kart / Vortex / Vega |
| 2017 | Jonny Edgar | Exprit / TM / LeCont |
| 2018 |  Paul Aron | FA Kart / Vortex / Vega |
| 2019 | Marcus Amand | Kosmic / Parilla / LeCont |
| 2020 | Ugo Ugochukwu | Kart Republic / Parilla / LeCont |
| 2021 | Freddie Slater | Kosmic / Vortex / MG |
| 2022 |  Anatoly Khavalkin | Parolin / TM / Vega |
| 2023 |  Oleksandr Bondarev | Kart Republic / IAME / Vega |
| 2024 | Dries van Langendonck | Exprit / TM / Maxxis |
| 2026 | Dean Hoogendoorn | KR / IAME / Maxxis |
