[macojoe]

I got this from the guys on Iboats:

what makes her shut down: the keyswitch connects a kill wire originating from the powerpack(s), black with yellow tracer, to a ground wire, black.

The keyswitch has two terminals marked "M" - one with the black and the other with the black/yellow...when the key is off, those two terminals should be connected.

The emergency kill switch, which you should have one of, by the way, does the same thing, grounds out the kill wire.

Another way to shut it off is to flood it out by pushing the key in to activate the primer.

Assuming your new keyswitch is hooked up right, the kill wire must have become disconnected or developed a break inside the insulation somewhere between the powerpacks and the keyswitch. Could be the ground wire I guess, but then it should have no effect on idle speed.

I'm guessing by the change in idle speed that one of the packs' wires has got disconnected somehow, so you're shutting off one bank of cylinders but not the other.

To find out which one, use an insulated spark plug boot tool to pull a spark plug wire with the engine running and the key off. If the RPMs drop noticeably, then that cylinder is still on. If it doesn't change, then it is off.
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I had the same exact thing with my 200 Evinrude. It turned out to be the exact thing mentioned here. I tracked the yellow and black wires from the power pack and sure enough there was a connection off. Reconnected it and everything is perfect now.

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Now if I can figure out what the hell they are talking about??