Fitting Dyna Coils under tank?! 1980 750-4

If it's high tension leak, it won't produce voltage against the battery ground. The high tension voltage path is purely coil-to-motor-back-to-coil. A leak might try to find a different (or partial)path from engine-to-frame-to-coil. This is possible if the wrench was touching or even near the carbs since the carbs are often frame-grounded through the throttle cable, but isolated from the engine by the rubber carb holders. You could try to measure voltage from carbs to engine, but meters measure average voltage. The pulses are so short-duration, the average may not register much at all. Try AC and DC in these cases, since both components (AC and DC) exist in pulsed DC.

...all conjecture at this point, though.

Good point... I bet the wrench was touching the carbs. I only have one 5/8 wrench, so I gotta use a crescent wrench to hold the bolt down while turning the jam nut. So, maybe I did touch the carbs. So, I should look at moving around my secondary wires a bit to see if that remedies the problem?

A while ago, after installing the new coils and wires, you said you heard arc snapping on the bike. Has that gone away? If not, I'd definitely move the wires around and look for that arc.

It could be that the spark isn't originating from the bike but from you!
Walking across a nylon carpet can generate a static charge of up to 15KV in a human body.
This is why we have to take static protection measures with CMOS and certain other types of semiconductors.
As an aside...I know a lady who can put her finger close to a water tap and a spark jumps from her.
She has a husband.....and kids.
I didn't dare ask how they get on in the bedroom.:kiss: :woohoo:

Probably an electrifying time was had by all! I've read about a woman that could stop her wrist watch and then make it run backwards(it would only work on wind up watches as the digitals and quartz were not affected). Human magnetic fields?