The present invention discloses an air-entrainment mechanism for carbureted engine. The mechanism includes a plunger valve controlled by a solenoid. The solenoid is powered by a battery with a switch electrically coupled thereto.FORGED STEEL VALVES The plunger valve is interconnected to the carburetor to allow additional air entrainment. The solenoid is coupled to the valve for opening and closing the valve.Butterfly Valves The switch electrically couples the solenoid to the battery to activate the solenoid for movement of the valve. The switch disclosed herein includes a temperature sensor and an engine-running sensor. The switch is then closeable when the temperature sensor detects an engine temperature within a predetermined range as long as the engine is not already running. Resilient Seated Gate ValvesA hot-start mechanism for an internal combustion engine carburetor having an airflow passageway, the mechanism comprising: a valve in fluid communication with the airflow passageway; an engine-running sensor interconnected with said processor, said engine-running sensor providing a signal to said processor indicative of whether said engine is running; an electrically-operated valve-movement mechanism operatively connected to said valve to selectively move said valve, activation of said valve-movement mechanism opening said valve when said engine-running sensor indicates that said engine is not running to admit additional air into the airflow passageway; and a valve switch electrically coupled to said valve-movement mechanism for activation of said valve. A solenoid-operated plunger valve controls airflow from the external environment to the air fuel mixture of the carburetor for an internal combustion engine. During normal operation, the valve plunger extends into the carburetor body, blocking the air passage used for introduction of additional air into the intake passage. During restarts at operating temperatures, the normally open switch is closed by the operator's thumb at the handlebar when hot engine conditions require additional air into the intake passage. Closing the switch allows electrical current stored in the battery to energize the solenoid, removing the plunger from the carburetor body and introducing additional air into the intake passage. In another preferred embodiment, there is a toggle switch that allows for “hands free” operation of the hot-start valve during race conditions. The toggle switches the hot-start system between manual (push button) activation and thermal switch activation with a time-out circuit. The time-out circuit allows for a predetermined amount of time to pass with the hot start activated while the engine is not running and above a set operating temp. This further reduces the need to visually locate a hot-start activation switch when quick restarts are necessitated by engine stalls during competition.

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