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    1991 Johnson 120hp V4

    Thank you! I will start from there and keep you posted if I have any further questions, your help is much appreciated!
  2. B

    1991 Johnson 120hp V4

    I have a 1991 Johnson 120hp V4 outboard engine. Last year it worked very good, however this year I’m experiencing some problems with it. It has 120 pressure on every cylinder. When I started it recently it works but on one of the cylinders the plug has turned black. The engine does not work...
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