(57) A device suitable to transitorially enrich the mixture delivered by a carburetor
includes a housing (1), enclosing two chambers (5) and (6), which are separated by
a diaphragm (3); chamber (5) communicates with the manifold through a channel (7);
chamber (6) communicates with chamber (5) through a metering hole (8), which crosses
the plates (4a and 4b); a spring (9) and the forces due to pressures acting on the
2 diaphragm sides (3) act on the diaphragm (3); a chamber (13) separated from the
chamber (6) by a diaphragm (11), communicates with the float, chamber (2) through
an inlet and with the main circuit (15) through an outlet (16), closed by a valve
formed by a spring (18), suitable for pushing a sphere (19) on a seat (17). A bar
(20) integral to the diaphragms (3, 11) supports a pushing rod (24), which under the
action of pressure forces acting on the diaphragm (3) removes the sphere (19) from
the seat (17), opening the outlet passage. The fuel is metered out by a bush (25).
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