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Recent content by fisherman1

  1. F

    Merc 9.9 vibration

    Also, what would cause plug fouling on a 4 stroke?
  2. F

    Merc 9.9 vibration

    Recently purchased a 2019 used 9.9 4 stroke merc. Took it out for the first time yesterday and noticed a bad vibration at trolling speed and when accelerating. Almost felt like one cylinder not firing. Pulled the plugs and one plug looked fouled( insulator was black). I'm new to these motors but...
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