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  1. K

    Merc 90 tower of power water in fuel

    So have been dealing with a problem for awhile and I’m trying to get down to the root cause. Maybe I am missing something so that is why I’m asking here. Every weekend when I go and try and start it won’t. I have narrowed it down to fuel. And water in fuel. To start it I hook a portable tank. It...
  2. K

    Water in gear oil

    I would like your opinion on something. This is an early 80's Mercury 90 inline 6 cylinder. Ever since i have owned this boat (15 years) I have always seen very small amounts of water in the lower unit gear oil. When I say small, I would say less than 1oz of water. I know this because I used to...
  3. K

    90 HP early 80's 6 cylinder starting without key

    I have an early 80's Mercury 90 Inline 6 cylinder, tower of power. I am troubleshooting a starting problem which seems to be no spark on 3 cylinders. It's hard for me to turn over the motor with the key and look for spark. Is there a way to jump some wire at the motor so that I can turn over the...
  4. K

    Mercury 90 power trim doesn't hold the motor up.

    I have tried everything and looking for some fresh ideas. I have a 81' Mercury 90 6 cylinder, it has 2 trim/tilt cylinders and the pump w/ valve is inside the boat. 4 hoses. So the problem is that the motor will drop. When testing somethings it will fully drop in a couple days and somethings it...
  5. K

    Mercury 90 L6 ignition

    Hi, I am hoping to get some answers about my ignition problem on my early 80's 90hp inline 6 (tower of power). So over the last couple of years I have experienced some intermittent starting issues (weekend to weekend). But when it starts it runs great and would always start that weekend. This...
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