Kawasaki FH680V Overheating

[ILENGINE]

if neither coil will spark with the ground wire connected, then the ground wire or key switch would be the failed part.

And if I replace the coils the problem goes away. See it at least once or twice a year. And in your scenario the coil that is still connected to the ground wire would still not have spark. But if I disconnect one coil they both will have spark including the one that should be grounded through the faulty ground wire or key switch in your explanation.

On the second example, if this scenario happens with the ground wire disconnected, it could be weak coils or the air gap being out of spec. This would be a very rare event. Definitely not a common occurance.

I suspect weak coil, but for me it is common enough that I see annually Normally shows after a rain or heavy dew. In all cases the epoxy will have cracks which could result in moisture intrusion.