serenity3743
Serious Thumper
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Striving to better, oft we mar what's well
Posts: 778
Black Mountain, NC
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I believe it has been established that the Savage/S40 spark plug fires on every revolution, on the TDC of the intake stroke and of the exhaust stroke. Most singles would fire once every other rev, only on the TDC of the intake stroke. I think that means an unmodified tach would show 2x the actual rpms on our bike. Some tachs can probably be programmed to compensate.
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