1971 Kawaski CDI Capacitor Discharge Ignition - Vintage Motorcycle Ad

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1971 Kawaski CDI Capacitor Discharge Ignition - Vintage Motorcycle Ad<br>Original, vintage magazine advertisement<br>Size: Approx. 8" x 11" (21 cm x 28 cm)<br>Condition: Good<br>SPACE AGE, SOLID-STATE ELECTRONICS<br>HERE’S HOW IT WORKS<br>Capacitor Discharge means that a capacitor is charged<br>for a brief moment and when it discharges, the spark<br>plug fires. To charge the capacitor, battery (or magneto)<br>power Q is first stepped up to 400 volts by a dc-to-dc<br>converter o This voltage is then stored in capacitor<br>Q. The capacitor Q is controlled by a thyristor Q<br>which functions as an electronic switch. It has a built-in<br>gate that is opened by voltage pulses supplied by a<br>signal generator Q mounted on the generator rotor<br>shaft. The voltage pulses are the timing pulses. When<br>a voltage pulse opens the thyristor gate, the 400 volts<br>stored in the capacitor Q is applied to the primary<br>ignition coil The secondary ignition coil @ steps<br>up this voltage to 30,000 volts and fires the spark plug<br>0. The spark plug 0 has a built-in booster that steps<br>the voltage up even more.<br>The superior advantage of CDI is that it never needs<br>to be adjusted or timed — no moving parts to wear out —<br>and it greatly improves low-end pulling power without<br>sacrificing high rpm output. The result is a constant<br>ignition system that eliminates miss-fire and provides a<br>stronger power impulse with each rpm.<br>11907-7108-08<br>