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  1. M

    2004 90hp 2-stroke Idle RPM and Loss of Spark

    I just got new plugs when they serviced my engine so today I took out my boat for a test run. The good news is she fires right up, but I think she sounds different. I used to think I could hear her hit all three cylinder. She idled at 800 rpm and didn't hit above 5000 rpms at WOT. Is it...
  2. M

    2004 90hp 2-stroke (low rpm at WOT)

    So I finally got my boat out this year, and it idled well and had good speed. After a few hours tubing (plenty of screams and giggles), I decided to check the rpms at WOT on the way home and noticed it reached 5000 compared to the usual 5500. The boat has been garaged with fuel stabilizer and...
  3. M

    Normal 90 hp water pressure values

    I am getting my boat ready for some cruising, and wanted to know if anyone knew what the water pressure should be for a 2004 90hp 2 stroke mercury. I wanted to check, because I noticed I only get about 3 psi when running on the built in hose connection (telltale is fine). Also, I have not...
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