Reply To: ‘79 Johnson 25 hp

[frankr]

I just dunno. But let’s consider what it probably ain’t. There is one driver coil that generates electricity and it charges the capacitor in the power pack two times per rev. So I can’t imagine any scenario where it would only charge every other rev on one side only. There is only one sensor under the flywheel to tell the power pack when to fire. It sends the power pack a positive voltage to fire one cylinder and a negative voltage to fire the other one–kind of like swapping a battery end for end twice per rev. The polarity is determined by the north and south poles in the magnet in the flywheel hub. Hm-m-m-damaged magnet? Kind of a far out guess. Besides, why only every other rev? Beyond that, there are the external coils and spark plugs. But again, why only every other time?

I know this is just rambling with no answer. Sorry. Most people would just throw a new power pack at it and hope. I might also as a last resort, but I like for something to make sense.

Tried new plugs?