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Low Compression in Bottom Cylinder

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  • Low Compression in Bottom Cylinder

    Will running,my Yamaha 40HP went to 1/4 speed. No alarms sounded. When checked, I had compression of 120 in the top cylinders but only 30-35 in the bottom cylinder. I pulled the head and see no scarring on the cylinder walls.

  • #2
    do you see blow-by on the head gasket

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    • #3
      From what I can tell, the head gasket looks O.K.

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