Patent ID: 8622031

Claim:
A method of controlling supply of supplementary fuel through a supplementary fuel supply passage in a carburetor for an engine, comprising: providing an electromechanical valve in fluid communication with the supplementary fuel supply passage; determining engine speed; powering the electromechanical valve to supply supplemental fuel to the engine as a function of the engine speed when the engine speed is above a first threshold speed wherein the valve is powered if engine speed is above a threshold speed that is higher than a normal operating speed of the engine for at least one first cycle of a predetermined number of at least one first revolution out of a predetermined plurality of revolutions of the engine greater than the at least one first revolution; determining a second engine speed after the at least one first cycle; and if the second engine speed is above a second threshold speed higher than the first threshold speed powering the electromechanical valve to supply supplemental fuel to the engine for at least one second cycle of a predetermined number of second revolutions greater than the at least one first revolution of the first cycle out of a predetermined plurality of revolutions of the engine greater than the number of second revolutions.