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    cylinder 4 is not firing

    Im troubleshooting a 1988 classic 50. I hooked up a digital rpm meter to each spark plug wire and all the cylinders are about the same except #4 which is about half the rpm. Engine bogs down and i am suspecting this is the problem. Now not sure where to go from here.
  2. I

    Crankcase Pressure Test Fail

    I removed the powerhead from a 1988 Classic 50. I am trying to figure out the problem with this motor. I have gotten to the point of pressure testing the engine and it will not hold any pressure. The first time I pressure tested it air was leaking by the lower oil seals. I removed the seals...
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    1988 Mercury 45HP stops accelerating/bogs midrange.

    Good evening, I have been attempting to fix a outboard for about 6 weeks now (tried several things from these forums). I have had 2 mechanics take a look and diagnose it with no solutions. The motor idles and runs great until half way. At the same point every time the engine stops increasing...
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