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The CDI gets its power from the exciter coil on the stator and the voltage from this coil will vary with engine RPM, but it can be as high as 60-100 volts AC or more at higher RPM's, if I correctly recall. The exciter coil on the stator is usually the largest coil you can see. Some stators I've seen use two excitor coils, but the excitor coil(s) are usually significantly larger than the lighting coils and are very easy to spot when looking at the stator. The voltage supplied from the stator excitor coil is supplied through the CDI to one side of the ignition coil (the side with less windings on it). The ignition coil takes this AC voltage and steps it up to more than 10,000 volts and connects it to the spark plug through the spark plug's wire. The CDI unit is basically a fancy time delayed switch in that it sits there storing up electricity in a 'C'apacitor (hence the 'C' in CDI) until it receives a pulse from the magnetic pickup. Upon receiving this pulse, the CDI will then wait a certain amount time as pre-determined by the designed ignition advance curve before it 'D'ischarges (hence the 'D' in CDI) the stored electricity into the primary side of the ignition coil, which steps up the voltage via secondary windings and supplies it to the spark plug through the spark plug wire.

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