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  1. M

    SPARK TESTERS?

    I've read references to "spark testers". Is there something out there beyond the device that you connect the spark plug cables to and then crank the engine and watch for a spark to jump the gap? I believe Stevens Instruments in Illinois offeres such an item. How is that different than pulling...
  2. M

    90 hp starting problem

    I have a 1983 90hp inline 6 cyl. It will only start if I advance the throttle while cranking. Isn't this advancing the timing which would indicate the timing actually isn't set correctly. Once stated it runs great except that it likes to foul out plugs when running slow. MAybe further...
  3. M

    90hp doggy for a few minutes

    My 90hp is hard to start but once I get it going things still are not right. It has no power for a few minutes and then it seems like additional cylinders "kick in." Once things are all warmed up and running the boat runs fine. If you dock it and it cools down completely the problems...
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    1981 Mercury 90HP Switchbox Problem?

    The motor is somewhat difficult to start but once running it seems to run ok. However when you put it in gear and advance the throttle it bogs down and seems to be running on 3 cylinders. This continues for several minutes and then it acts like additional cylinders kick in in 3 steps. Since...
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