S3: THE LATEST EVOLUTION OF TM KART DIRECT DRIVE ENGINES

TYPE
The TM Kart S3-Senior and S3-Junior engines are a 2-stroke engine, like the vast majority of racing-type kart engines.

DISPLACEMENT
The TM Kart S3-Senior and S3-Junior engines has a bore of 53,95 mm and a stroke of 54.40 mm for a cylinder volume of 124.36 cm³.

STARTER
Starting is manual: to start the kart engine, you need to rotate the rear axle manually or push when the kart is on the ground. All this is facilitated by the presence of a decompression valve on the engine head, which makes it easier to push the kart itself.

TRANSMISSION
There are two "big families" of kart engines: Direct Drive and Shifter. The TM Kart S3-Senior and S3-Junior are a Direct Drive engines, therefore non-shifter, and without a clutch, therefore with direct drive: when the kart stops, it doesn't stay running, but switches off.

HOMOLOGATION
The engine was designed and built by TM Kart for the Direct Drive FIA Karting, OK and OKJ classes. Its international approval (which you can find here) is valid for 6 years and ensures that owners can take part in all types of events that adopt CIK-FIA regulations. There is only one engine, the one designed and built for the OK-N class, but simple technical interventions can also turn it into the version for the OK Junior class, the OKJ (read more here Dossier| FIA approvals: what they are, what they are for, how long they last... The ultimate guide!).