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If the mixture was too rich, would it not affect all the cylinders? Also it's not the soot on the stern i'm concerned about. It's that something has changed and the spark plug is completely covered in black velvet. (soot). So even though it still runs, it's not running as it should.
Last edited by Renegade; 09-20-2018 at 04:07 PM.
Reason: spelling mistake. adding comment
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