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Mariner 90 3cyl no spark on two cylinders

samdog

New member
"1988 model Occasionally it ru

"1988 model Occasionally it runs perfectly, Usually I leave the dock with it running OK then no spark on 2 and 3. While running it may stop firing on one or more cylinders then it may smooth out minutes later. On a bad day only one cylinder will fire for the whole day. I replaced the 3 ignition coils."
 
I can replace the switchbox. I

I can replace the switchbox. I didn't know why it would work sometime and not others. I guess I thought either it works or not.
 
You were right! I changed the

You were right! I changed the switchbox and it runs as good as a 20 year old Mariner can go!
 
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