Set of 10 maximum and minimum EVOK cicler jets DELL'ORTO 4 mm 115 118 120 122 125 128 130 132 135 138 for DELLORTO carburettors SI 20 22 24 VESPA 125 150 160 180 200

The new series of jets for DELLORTO, KEIHIN and MIKUNI carburetors. The importance and characteristic of the new production of main jets is the high manufacturing precision and the millesimal control carried out on the measurement of the passage hole in order to guarantee a correct modification to the carburetion. The main jet acts on the carburetion mainly for the last three quarters of the throttle opening, but still makes its influences felt even if in a less marked way starting from the medium openings. Changes to the carburetion: Increasing the size of the jet enriches (fattens) the carburetion, increasing the quantity of petrol sucked into the engine. Reducing the size of the jet impoverishes (leans) the carburetion, decreasing the quantity of petrol sucked in by the engine. An increase in environmental temperature or a rise in altitude above sea level causes a lower density of the air, causing the carburetion to become heavier. Incorrect carburetion adjustment with excessive lean (reduction in jet size) causes the engine to overheat and lead to seizure. Incorrect carburetion adjustment with excessive greasing (increase in jet size) reduces performance by increasing fuel consumption and causing fouling of the spark plug