Abstract: A carburetor is described, comprising a main barrel; a throttle; an idle system positioned between a cavity full of fuel and the main barrel, with progression and idle mixture holes, the opening of which is regulated by the conical point of an element to be positioned in a first position with respect to the said idle mixture hole by means of screws; the system comprises a hole for metering the fuel and a bush for metering the emulsion air; a first electromagnetic element has an obturator for closing the said hole with a ball; the element is connected to the movable keeper of a second electromagnetic device for moving the conical point away from the idle mixture hole; control devices are present to operate the said electromagnetic devices during accelerator release.

Abstract: A carburetor comprises: a main barrel; a throttle situated in the barrel; an idle system which, from a cavity full of fuel, opens into the main barrel through progression and idle mixture holes; the idle system comprises elements for metering fuel and air, which form a primary emulsion. There are several suitably sized passages in the idle system through which the fuel or emulsion flow; the following cooperate with the said passages: first elements for excluding the flow from some of the said passages, keeping at least one open to prevent the idle system from emptying during accelerator release; second organs for positioning the said first elements; third devices for recognizing accelerator release and checking the said second organs.