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no spark after ~3000 rpm in cylinders 1 & 2?

Hand750

CB750 New member
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Iowa
I was timing my 1980 cb750f today, got it set where it should be. I noticed that above ~3000 rpm cylinders 1 and 2 don't get a spark. It seems strange to me because 1 and 4 / 2 and 3 come off of the same coil.. it is a new bike to me, and wasn't running when I got it.

Any help with this would be highly appreciated!

Thanks!
 
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