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    OMC 5.0L 305 Engine Vibration

    Hi All, I have a 1988 omc 5.0l, between 2500-3500rpm there is a vibration, its not awful but I don't like it. I have taken off the outdrive, removed the front pulley (so no belts or accessories running) and it still vibrates I have not removed the harmonic balancer but I think I can get at it...
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    1987 yamaha 115

    I might be getting a boat with one of these on it. Any thing I should look for specifically? Any problem areas?
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    1976 850 weak spark

    I have a 1976 merc 850 with the thunderbolt ignition. My problem, all of the sudden while out boating the motor died, didn't sputter just stopped and won't start. Played with it a bit, cleaned the spark plugs and it started, ran for about a minute, ran totally fine, and then suddenly died and...
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