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  1. #1

    Default 1986 mercury 60hp

    I just bought a boat with a 60hp mercury. Currently you have to put it in gear and ease the throttle to get it to go. If you give it throttle too fast the engine will die. The boat was only going 3000rpm at full throttle. I took the cover off and held my hand over each carb to make sure it was firing on all cylinders. I did one carb at a time and noticed change in rpms when i cover each one. After that the boat was able to go up to 4000 rpms. I got to the fishing spot and turned it off. When I left it would only go to 3500 rpms. Any idea what the problem could be

  2. #2
    Join Date
    Sep 2003
    Location
    New Tripoli, PA, USA!
    Posts
    15,190

    Default Re: 1986 mercury 60hp

    If that's a triple, they are notorious for bogging on throttle up. Try adding 1/2 turn OUT on each idle mixture screw.

    Jeff

  3. #3

    Default Re: 1986 mercury 60hp

    Any ideas about the other problem. It almost feels like its not going in gear all the way. I tested compression and its 105 on all 3 cylinders. I think it could be a carb problem or lower unit issues. What do you think thanks

  4. #4
    Join Date
    Sep 2003
    Location
    New Tripoli, PA, USA!
    Posts
    15,190

    Default Re: 1986 mercury 60hp

    Unless your tester reads low, that's not good compression--about 130 to 150 is normal. Can you try another tester?

    If the lower unit was not grabbing in gear, you'd know it! Try my crab fix and get back to us.

    Jeff

  5. #5

    Default Re: 1986 mercury 60hp

    I cleaned the carbs tonight and adjusted the idle screw like you said. I also drained the lower unit fluid and there were a few small metal pieces on the magnet is this normal. Tomorrow I am going to refill the lower unit fluid. Also i have a extra empty tank that im going to put new gas in to make sure that wasn't the issues. Any other sugesstion before I take it out? Also will retest compression tomorrow when i borrow another gauge

  6. #6

    Default Re: 1986 mercury 60hp

    What lower unit fluid do you recommend for a 95 mercury 60hp? Had the year wrong in the original post

  7. #7
    Join Date
    Sep 2003
    Location
    New Tripoli, PA, USA!
    Posts
    15,190

    Default Re: 1986 mercury 60hp

    I use 115 viscosity oil.

    Jeff

  8. #8

    Default Re: 1986 mercury 60hp

    Well I think I got it fixed. It stopped shutting off. The issue with it not getting full power was a bad tank connector. Now it goes 4500 rpm and goes about 30 mph. Im going to see about a new prop to get more speed. Thanks for your help

  9. #9

    Default Re: 1986 mercury 60hp

    I currently have a 15 pitch prop. which size do yall recommend to increase rpms. Its going on a 16.2 ft wahoo

  10. #10
    Join Date
    Sep 2003
    Location
    New Tripoli, PA, USA!
    Posts
    15,190

    Default Re: 1986 mercury 60hp

    14 pitch?

    Jeff

  11. #11

    Default Re: 1986 mercury 60hp

    Jeff, doesn't a 1" pich change, change your rpm by about 200.

    If so, then, since he is currently running 4500 rpm at WOT. I would expect that his motor is designed for 5200 - 5500 at WOT.

    I would think a 12 or 13 pitch would be a better choice.

  12. #12
    Join Date
    Sep 2003
    Location
    New Tripoli, PA, USA!
    Posts
    15,190

    Default Re: 1986 mercury 60hp

    Agreed.

    Jeff

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