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  1. J

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

    Thanks for the reply. Well, I believe I found the problem - lime/scale buildup in heads. Will post final results when through.
  2. J

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

    Everybody's got an opinion, I need answers.
  3. J

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

    Never had a problem with any readings at idle. First of all, any time you are running on a hose the engine should never be above idle, inboard or outboard. Any tests above idle the engine should be submerged. You can't tune an engine on a hose. Also, inboards will collapse the hose above idle...
  4. J

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

    At idle it doesn't make any difference if it is on a hose or submerged.
  5. J

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

    175 degrees
  6. J

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

    Temperature not high enough to set off alarm(205-210). As far as pump pressure, it came from Mercury.
  7. J

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

  8. J

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

    175 degrees
  9. J

    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...
  10. 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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