Can be used on 2 and 4 strokes engines. Latest development (2016) for motorbikes. Depending the engine, ESC 1935 offers approx 1 to 2 % performance increase over ESC 1933. Lots of rivers enjoy the precision feeling and the reactivity between the throttle handle and the rear tire. ESC 1935 is ETS ultimate Superbike & Moto GP racing fuel.