The CDI is for your ignition and can either be powered by DC or AC dependent on the engine wiring. The rectifier converts AC stator voltage to DC voltage.
The choke can run on AC or DC as long as the resistor is inline with either. The CDI must be a DC version to run on DC or and AC version to run on AC (applying the wrong voltage will burn up the the CDI). The battery must be charged using DC. The starter motor and solenoid require DC to function properly The lights can run on AC or DC without a problem.
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