Control system for secondary transfer port in dual carburetor

Claim 1

A control system for a secondary transfer port in a dual carburetor for an internal combustion engine, said control system comprising: an ignition switch; a primary evaporator having a first throttle valve therein; a secondary evaporator having a second throttle valve therein and a transfer port opening thereinto; a magnet valve for opening and closing the transfer port; an electric circuit between said magnet valve and said ignition switch; an adjusting switch in said circuit for closing it during high load engine operation to open the transfer port and for opening the circuit during low load operation to close the transfer port, said switch comprising: a lever pivotable in accordance with the degree of openness of the first throttle valve, said lever having a first contact thereon and being adapted to pivot throught a link means provided between the lever and the first throttle valve when it is rotated, said first contact being electrically connected to said ignition switch; and a fixed contact contactable by said first contact, said fixed contact being electrically connected to said magnet valve.