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Discussion Starter #1
Hi all, I need to know the cranking rpm of an electric start model. Must be accurate within 10-15 rpm, no guesses allowed!
Thanks, Tom
 

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Engine rpm or starter motor rpm? I’m not sure I can help but trying to think of how it could be observed or derived or calculated.
 

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Discussion Starter #3
engine rpm with plug in but not firing. the pickup coil could be used with a very low rpm tachometer, or a scope, or a mechanical gauge on the end of the crank.
 

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I have none of the above, but could I do a simple stopwatch and count the strokes by sound? Sorry if this isn’t helpful.

I really want to help because I think your CDI development has and will continue to help a lot of people who have exhausted most other options. The whole CDI thing should be filed under “Here be Dragons”. And I admire you for tackling it.

Plus I want one of your CDIs with a tach wire. Cheers and good luck
 
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