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I installed a Hardwire brand hour meter wich also has a tach function. The manual says the idle speed is 1900-2100 but the tach is saying 950ish. I wrapped the wire tightly around the plug wire as per instructions...it's a 2015 yz250fx Thanks!

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2 strokes fire the spark plug once per revolution (RPM), four strokes fire once every other revolution - i.e. every 2 rpm's.  Consequently, if the meter doesn't have a two stroke vs 4 stroke setting option, you have to multiply the reading by 2.

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I installed a Hardwire brand hour meter wich also has a tach function. The manual says the idle speed is 1900-2100 but the tach is saying 950ish. I wrapped the wire tightly around the plug wire as per instructions...it's a 2015 yz250fx Thanks!

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