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    Mercury 150 xl 2 stroke, carbureted, head temperatures vary by 15 to 25 degrees

    2002 Mercury overheating to about 160 to 175 degrees. Poppet valve stuck partially open, replaced. Pump, thermostats, grommets were replaced when the motor mounts were replaced last fall. Checked the head temperature using infrared gun. Thermostats started opening at about 130 degrees(small...
  2. J

    1994 Johnson 70hp will not idle

    1994 70hp Johnson on a 20' pontoon boat. Compression 125 all three cylinders, new water pump 08, new plugs, premix oil and gas. I have had this boat/engine about five years. Cranking is not a problem, hot or cold. The problem is after the engine runs for a minute or so at idle it slowly reduces...
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