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    1992 mariner 50hp 3 cylinder, rough running. weak spark on 2 cylinders

    Hi all, I have a 1992 mariner 50hp 2stroke 3 cylinder and I bought the engine knowing it hadn't been run in a while. I've got it running but its not running right. I've put some spark tester light things on the plugs to check they where all firing. Cylinder 1 and 3 seems to have a weak spark...
  2. N

    1979 mercury 40hp 402 very weak spark advice needed

    Hi all i'm new to the site and sorry my 1st post is a problem. I have a 1979 mercury 402 40hp and when i dug it out the shed i put some fuel in it and it fired straight up (it had been sat a few years). i order new impeller and new plugs and installed them and everything seemed ok. I then...
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