They do not have an electric starter: to start the engine it is necessary to push the kart (or manually rotate the axle when the kart does not touch the ground). All this is facilitated by the presence, in accordance with the regulation, of a decompression valve on the engine head that makes it easier to push the kart.
The engines were designed and manufactured by Modena Engines for the Direct Drive FIA Karting, OK and OKJ classes. Their international approval (which you can find here) is valid for 3 years and guarantees that owners can participate in all types of events that adopt the CIK-FIA regulations (to learn more, read "Dossier | FIA approvals: what they are, what they are for, how long they last... the ultimate guide!").