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Originally Posted by 5th_bike
Wel if it sparks every revolution but only explodes every other revolution, and it counts a spark as one revolution, then it will indicate the right rpm.
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That's true. I said "if the tach isn't set right". Some have switches to change from "spark only on power stroke" (single fire) to "spark every revolution" (double fire). If the tach is set for single fire on a double fire machine, it will read 2X the real RPM.