I traded out the coil from another yamaha jet ski that i had that had a 650 motor in it as well. And even after i changed them out no luck. Maybe both skis coils are bad
was the other plug still in the head and connected? we had a problem recently with one plug in and connected, while testing the other plug and got a fant/weak spark. upluggled the one still in the head and no spark on the one we were testin. it was apinched under the flywheel/stator assy.
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