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I read somewhere that with the two electrodes, the spark prefers the narrower gap and stays on that side until the gap widens over time, and then the spark switches over to the other gap, because now it's the narrow one. It alternates like that as the gaps wear over time.
Since this plug fires twice per cycle in this wasted spark ignition system, it wears faster than in an engine that fires once per cycle, and having the two electrodes makes up for that quicker wear.
That's what I read, anyway.
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