A photoactive ionization high-tension pulsator is provided between the distributor and the spark plug of a carburetor motor ignition system. The pulsator comprises tubular housing, electrodes disposed therein in spaced apart relationship, and a ring positioned on the inside wall of the tubular housing and being separated from the electrodes. The ring comprises a photoactive material responsive to break down between the electrodes for causing ionization of the gas, whereby to provide high-frequency current in the motor ignition system.
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