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Ignition coil performance test

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deltarider:
On p. 90 of the Shop Manual CB500-550 we find a coil test prescribed (see below). I don't quite understand Fig. 275 that shows three pointed electrodes. Why three and not just two?

AshimotoK0:
Explained here  :)  :-

https://www.themagnetoguys.co.uk/Spark-Test-Gaps

deltarider:
I'm afraid I still don't understand. The ones next to each other, are they both Ground?
Anyway, this is how I've tested mine (be it statically!) the two plugcables facing each other sharing (and waisting) a spark. The black stripes are 7 mm apart. BTW, the white 'stripe' you see is not a spark, but a mere reflection of light. Has any of you seen that tester in the Honda fig. in real life/ Is it capable of testing dynamically?

Bryanj:
Not only seen one but used one in the 70's and the box had like a set of points so you had continuous sparking and a knob to increase the gap on the two contacts opposite each other till the spark diverted to the side one.

Hope that makes sense

deltarider:
Thanks, Bryan. Was it a set frequency or could you vary?

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