Although used with gasoline (petrol mixture added 2 to 4% special oil for 2 -stroke engine), this engine does not require the use of an electronic ignition system. It works thanks to a specific G5 -type candle to be fueled by a 1.2V / 2.5A battery for startup. Like all other 2 -stroke engines, it benefits from the exceptional manufacturing qualities of the O.S. brand. Equipped with an O.S. For linear accelerations and great ease of adjustment. From a 15cc displacement, its power and its reliability allow its use on the original models for engines from 12 to 15cc (2 and 4 times). Delivered original with silencer E-4040. Special silencer for models (E-4051) available as an option).