TM Racing has updated its S-Junior and S-Senior engines for the OKJ and OK classes, for which 2019 marked the beginning of the second cycle of homologations. The arrival of the S2 model brings with it less noticeable changes compared to the previous version, which was introduced when the KF class and the related electric starter, the free exhaust valve and the clutch departed the scene. Therefore, on its new models, what the Italian make has done is introduce improvements to its engines that have already produced excellent results.

Indeed, the first generation of TM Racing engines to come out with the return to direct drive can boast titles such as the 2017 FIA ​​Karting World Championship, won by Dexter Patterson, and the 2018 WSK Super Master Series, by Gabriele Minì: an impressive curriculum vitae that removes any doubt on the performance of the engines. Perhaps that is also the reason why the thermal management part of the new models approved for the 2019 - 2021 period has remained almost unchanged from the two predecessors. From the outside, the cylinder of the S2 Junior and Senior is indistinguishable from the S, both as regards its structure and the cooling channels. The same goes for the cylinder head, which houses the decompression valve to facilitate push starting. The only update involves the ports, always the subject of continuous research, which have been optimised to facilitate filling the combustion chamber.