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  1. J

    piston looks like swiss cheese

    I have a 1990 Mercury Outboard 150 Blackmax<br /><br />or I think it is a 90, I have the serial, it is OA99379965663-c1 (Not sure if that is a c1)<br /><br />I finally got the head opened up, took the cover off, and the sixth piston looks like swiss cheese, it is all chewed up like a rock got in...
  2. J

    Mercury Outboard (not firing)

    I have had an ongoing problem with my outboard. It is starting and running, but the engine does not sound like all the cylinders are firing. It sounds like it tops at 4000 rpm instead of 5500 rpm.<br /><br />Only going 30, the cooling system is working ok, and it idles fine, just when trying...
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