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  1. K

    1987 50hp Merc only 2 plugs firing

    I have a 1987 50hp 4 cylinder that only the top 2 plugs are firing. Do I have a bad switch box?
  2. K

    only 2 plugs getting fire

    help please, I have a 50hp Merc. 4 cyl. that only the top 2 plugs are firing. What could cause this?
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