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  1. L

    Runs rich air screws wont change anything

    Black smoke at idle plus full throttle,all four cylinders plugs have black sooty residue
  2. L

    Runs rich air screws wont change anything

    2004 yamaha 90hp 4 stroke,runs rich ,air screws do nothing primers changed. Timing correct,compression high on all four ,fuel filter plus fuel new Carbs rebuilt ,no corrosion ,floats at correct height ,no flooding its something affecting all 4 carbs #baffled
  3. L

    2004 Yamaha 50 hp 4 stroke t50tlrc running extreamly rich at idle. need help

    Did this problem ever get resolved I have the same condition on a 90hp 4 stroke ,everything you listed has been tried.
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