The Open 2-Stroke Championship presented by Word Racing.

Inclusive Rules Formula open to nearly all types of 2-stroke karts

Shifter Kart TechThe Open 2-Stroke Championship was created in 2016 to bring back the fun and participation in local kart racing. With a focus on making the fast 2-stroke classes affordable and open to most all types of 2-cycle engines, we are giving people a place to race competitively with either older “obsolete” engines, or the latest engines. Professionally run and coordinated with our local tracks, and grass-roots focused. We welcome all levels of Karters from the weekend warrior simply looking to hangout with his friends and have a great time, to the semi-pro Karter looking for competition and track time to prepare for big events such as the SKUSA Super Nationals and ROK Cup USA. This is a series that keeps costs to a minimum, and where camaraderie off the track and wheel-to-wheel competition on the track is the rule.

Click link below for PDF document explaining class weights, fuel, tires, etc.

The 2021 O2s Supplemental Technical Regulations manual


For the general 2021 OSKCS/PKA rules that we operate under, click the follwing link:

General OSKCS rule book


We require a driver information form for anyone new to the series - similar to a registration form.

2019 O2s Driver Information Form & Sign-up


O2s Championship classes are as follows:

- Shifter Open (KZ) -- Homologated /KZ engines and Modified Hondas

- Shifter Stock (Honda/ROK) -- Honda Stock Moto and Stock ROK. Also includes SGM L198 and SL204.

- O2s100 -- ROK VLR, KA100, X100AC, KT100* - Jr 310, Sr 350, Mstr 380.

- TaG Masters -- X30, X125T, Leopard, Rotax, Vortex ROK, Dragon, etc.

- TaG Sr. -- X30, X125T, Vortex ROK, Leopard, Rotax, etc.

- TaG Jr. -- X30, X125T, Vortex ROK, Leopard, Rotax, etc.

- TaG Cadet -- Mini/Micro Swift, Jr 1/2 restricted X125T, Vortex ROK, Rotax, 100cc Leopard, etc.

*See the Supplemental Technical Regulations manual for complete list of engines and weights

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