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Discussion Starter · #1 ·
I'm looking to bench test the coils on my 1972 650S, does anyone know the primary and secondary resistance values please? The bike wont tick over off the choke and so I've stripped and cleaned the carbs but before I put the tank back on I thought that I would test the coils as well given that the carbs didn't appear to have any blockages .
 

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I'm looking to bench test the coils on my 1972 650S, does anyone know the primary and secondary resistance values please? The bike wont tick over off the choke and so I've stripped and cleaned the carbs but before I put the tank back on I thought that I would test the coils as well given that the carbs didn't appear to have any blockages .
I had similar problem with my 354 stripped carbs twice checked spark etc. Timing was out,
It was firing after tdc !
 

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Discussion Starter · #5 ·
Thanks Teeny, I'm looking for what the actual values should be for the 650 Tornado specifically, I've got one at 3.7 ohms and the other at 3.6 on primary and secondary reads 6,400 on one and 5,990 on the other respectively, my problem is that I don't how how significant that either is or isn't.
 

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That's no problem I would expect anywhere between 2.5 and 4 Ohm primary for a 12V points type coil. The secondaries vary more than expected but it's a 50yo coil! You could set up a spark gap tester and warm them up a bit while testing to see if one outperforms the other. Substitution maybe with PCL or Lucas coils is a great way to test also, but always swap the old junk back again afterwards to prove it was at fault.


This could be much more sophisticated. Idealy you don't want it sparking that fast.
 
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