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    MercCruiser 3.0L Wet spark Plug Cylinder 4The

    Hi; The engine is hard to start and RPMs vary 200 to 300 RPMs when running, found SP wet. I have a fresh water kit on the engine, any suggested would be appreciated TIA Tom B
  2. B

    Low compression 3 out of 4 cyl. MC 3.0L engine

    Hi Started as just hard starting, mech worked on Carb and timing, then I wasn't able to get above 3800RPms. Still hard starting, they want to futher test for cyl. or Valves problems. I can't wrap my head around the engine worked fine on 3 fishing trips (hard starting), now no compression 3...
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