Polaris TX Starfire Owner's Manual page 55

THREE CYLINDER IGNITION
(Con't.)
series to generate high voltage in secondary coils at the
timed relation to ignite for each cylinder of engine.
Per revolution of the rotor, 3 sparks can be obtained for
each cylinder, but only one spark is used for actual
ignition and the other two wasted. Such an ignition
system as ours is called "Capacitor Discharge Ignition
System" (in abbreviation CDI system) . Accordingly this
CDI eliminates contact breakers and condensers in con-
ventional ways, in place of which this control unit named
"CDI Unit" embodying thristors, diodes, condensers, and
etc. therein.
2.2 Construction of Stator
The stator has six magnetic poles projecting in the inside
center which are of laminated steel plates with plastic
powder coating. Out of six, four pole cores are directly
wound coils and two leads are led out to light two bulbs-
12V, 37.5W each. In this case, when one bulb is gone, the
other can light normally.
The lighting output obtained also can be used for one
bulb only of 75W by putting those two leads together.
Next, onto the rest of the pole cores, the same number
of exciting coils which work as the electrical power source
for ignition are put and fixed by fitting plates.
Additionally, this stator is also designed to mount a coil
for preventing inverse revolution of engine and an in-
dicator for the purpose of adjusting ignition timing of the
engine.
2.3 Construction of Rotor
The rotor has such an outer appearance as shown; a boss
is rivet-fixed to aluminum diecast side plates, on the one
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