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  1. K

    90 efi Mercury 4 stroke over revving

    I have had prop off and inspected and it was OK, I have looked at lower unit and found nothing on or around it.
  2. K

    90 efi Mercury 4 stroke over revving

    I have a 90 hp on my 16 ft bow rider, it ran fine until 2 weeks ago, now it overrevs . I have replaced the prop hub and no effect. I have auto trim and tried every position and no help. I have a 21 inch pitch prop on the boat and I use to run at 4800 rpm at 45mph to 50 MPH but now, if I let it...
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