SPARK SYSTEM (20) including a plug and a passageway VENTURI ASSOCIATE (38), wherein said BUJIA is separated from the throughway VENTURI (38) and projects outwardly from one end thereof; And a member of electrode (32) surrounding one end of an insulative member (21) which in turn surrounds AY is separated from one main electrode (23) supported by the insulative member (21) WHERE AT LEAST ONE POINT said main electrode (23) is positioned such that you can create sparks between itself and SURROUNDING THE electrode member (32). THE electrode member (32) has a SO THAT DEFINE TOGETHER WITH THE insulative member (21), a precombustion chamber (30) surrounding the main electrode (23). THE electrode member (32) has at least one aperture (29) RELATED IN SPACE WITH PUNTA DEL main electrode (23) of the insulating member (21) and at throughway VENTURI ASSOCIATE (38), which allows communication between THE CHAMBER OF ENGINE CYLINDERS AND ASSOCIATE pre-combustion chamber.
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