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1975 9.8 model 110 cylinder issue

JWake

New member
Hi all,

Been wrestling with this one for awhile. 9.8 runs great for 10 minutes, then power drops and it runs rough. All of a sudden it will kick back in to full power with a thud. Then it will happen all over again.

I thought it was dropping a cylinder. Bad coil I'm thinking. Spark on both cylinders, and it jumps a 3/4" gap, lots of voltage.

Took it out today to test it after I repaired a wire on the kill switch. Same thing. So I shut it off, pulled a plug wire and tried to start it so I could isolate which coil it is. It started on each cylinder. Im starting to think maybe its not an ignition issue, and if not i don't know what it could be. Any advice on where to go next from you knowledgeable folks would be much appreciated.
 
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