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Cdi circuit using an scr a few resistors and diodes referring to the above capacitor discharge ignition circuit diagram we see a simple configuration consisting of a few diodes resistors a scr and a single high voltage capacitor. The cdi unit is powered by the ac current coming from the wrapped stator winding this current is stored in a capacitor within the cdi unit when a signal is received by the trigger pickup passing over the flywheel magnet the cdi will discharge the stored energy into the wires leading to the ignition coil. Does the ignition timing jump from each setting or is there interpolation there is interpolation for example if your settings say 25 deg 1100 rpm 45kpa 15 deg 1100 95kpa 40 3000 45kpa 31 3000 95kpa but youre driving at 1800 65kpa the timing will be between all of those values at about 267 degrees. As promised a schematic of the ht ignition circuit and some musing the magneto generator alternator has 2 poles the magnet is on the shaft so for every revolution there is a positive pulse and a negative pulse