Because one of our electrically gifted members went to great lengths with the tech department at Digi-Key to come up with specific caps which will work and hold up to the demands of the universal magnetos used in most of the OMC motors. Depending on their construction and ratings, others may have a very short working life and these ones were found to be the most reliable. The same cap with a lower voltage rating might work to but for how long? It seems these mags have very high voltage spikes and they felt a cap with the higher rating would be best in the long run. 850V might be a bit of overkill but at least they won’t let you down two miles from the boat ramp.
The .22 uF Orange Drops I’ve used for outboards are fairly large and there’s not enough room for them on the universal mag plates but they fit quite nicely on the larger mag plates of the prewar motors.
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