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Hour meter

Joined Oct 2006
381 Posts | 1+
Belgium
Purchased an hour meter/tacho on ebay. Got a question from the seller if I require a 2 stroke or a 4 stroke unit. Explanation for this is that a 2 stroke plug fires once per revolution and a 4 stroke once every 2 revolutions.

I remember reading somewhere that a SEM also fires every revolution, is this correct or am I wrong?
 
husabutt said:
That is correct.

So I went ahead and ordered a 2 stroke unit. Mounted it, but according to the meter, my engine was running at 14700 rpm flat out, so I'm guessing something was not quite right :)

Anyone can clarify this? Does the SEM spark every revolution or every second revolution?
 

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