Carburetor construction

Claim 1

A CARBURETOR FOR USE IN AN INTERNAL COMBUSTION ENGINE AND COMPRISING A MIXING CONDUIT, A FUEL RESERVOIR, A ROTATABLE THROTLE SHAFT EXTENDING INTO SAID MIXING CONDUIT, A THROTTLE VALVE MOUNTED ON FOR ROTATION WITH SAID THROTTLE SHAFT, VENTURI MEANS IN SAID MIXING CONDUIT ANTERIOR TO SAID THROTTLE VALVE, A PRIMARY FUEL SUPPLY SYSTEM ADAPTED TO DISCHARGE FUEL FROM SAID FUEL RESERVOIR TO SAID MIXING CONDUIT ADJACENT SAID VENTURI MEANS IN RESPONSE TO ENGINE DEMANDS, A METERING MEANS ADAPTED TO REGULATE THE AMOUNT OF FUEL PASSING FROM SAID FUEL RESERVOIR TO SAID MAIN SUPPLY SYSTEM, AN IDLE FUEL SYSTEM ADAPTED TO DISCHARGE FUEL FROM SAID FUEL RESERVOIR THROUGH AN IDLE PORT WHICH OPENS INTO SAID MIXING CONDUIT POSTERIOR TO SAID THROTTLE VALVE WHEN IN A SUBSTANTIALLY CLOSED POSITION, AND SAID IDLE FUEL SYSTEM INCLUDING AN ADJUSTMENT MEANS EXTENDING INTO SAID IDLE PORT SO AS TO REGULATE THE RATE OF FUEL FLOW THERETHROUGH, AND WHEREIN SAID ADJUSTMENT MEANS IS COMPOSED OF A RELATIVELY POROUS MATERIAL.