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Mercury Mariner 8hp 2 cylinder 1989 Factory service Manual? Week Spark.

Ted Speedy

New member
Hi, I would like to know if anyone has a factory service manual for this motor Serial #0C140802 or if you know where I can get a used manual ( I have the Selco manual it does me no good to vague. My problem is week spark on top cylinder causing the plug to foul I think I need to replace the switch box the coils tested good. I used a spark tester and got no spark to jump the gap so I switched coils and got a spark the engine will run with the week spark intermittently.
 
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Thanks, but I should have said that I already have the Selco Manual and frankly it does not have the information on my motor that I would need to properly diagnose this problem. No schematic or details on my specific power head. It's kind of a generic manual covering about 6 different versions of my outboard and very vague in some areas.
 
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