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285 Split Console Leaning while on plane

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  • 285 Split Console Leaning while on plane

    Hello everyone. New to the group. We have a 1085 285 split console Mako. We bought it with Evinrude 2"thirsty"5's. Boat ran great. We put Yamaha Salt Water Series 250's on it. Boat now hooks, leans on both sides once we go over 3700 rpm. It did not do this with the 235's. Any ideas of how to remedy the issue? I was thinking about putting 4 blade props instead of the 3 blades we have now.

  • #2
    Usually with a single the boat will lean to port because of prop torque. Do you have a standard and a counter rotating motors on? Another cause is to much pitch on the props. As the pitch increases the prop torque increases? Are you running similar pitched props now compared to the old motors? Typically when you go to a 4 blade prop you drop the pitch some which in turn may reduce the prop torque.


    Current
    '76 Mako 25 w/ '10 Yamaha F300
    Previous
    '85 Mako 21B w/ '94 225 yamaha
    '73 Mako 19 w/ '96 112spl Evinrude
    Brick, NJ

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    • #3
      Thanks for the reply. We have been talking about the same ideas. We do have counter rotating props but i do not recall the pitch of the old motor props. Hopefully i can borrow another set to try out rather than purchasing.

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      • #4
        If you have a standard and a counter rotating motors on the boat the fact they spin in opposite directions should eliminate prop torque. Could it be a weight distribution issue? Water stuck in the bilge area somewhere? Did you add any new equiptment like oil tanks with the new motors? Move the batteries to a new spot? Thats a pretty big boat and I find it hard to believe a couple oil tanks could have much of an impact, just tossing out ideas.


        Current
        '76 Mako 25 w/ '10 Yamaha F300
        Previous
        '85 Mako 21B w/ '94 225 yamaha
        '73 Mako 19 w/ '96 112spl Evinrude
        Brick, NJ

        Comment


        • #5
          how are the trim zinc's aligned? Is the tie bar between motors set so the motors are properly oriented?

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          • #6
            When on plane take a look behind the boat at the wakes from the motors. They should meet somewhere in the range of 25 to 50 feet aft of the vessel. If they don't converge or actually diverge, the toe out is incorrect. Also check the height of the cavitation plate. If the motors are mounted too high, it is possible when turning for the prop on the outside of the turn to loose bite.
            Regarding the trim anodes on the lower units. If you have a regular and a counter motor, you don't need anodes with tabs. If you have tabs, they should be set at a straight angle

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            • #7
              Hey Guys. Finally got the boat splashed. Boat still behaves a little funky. Cavitation plate is even with the bottom of the boat. Tried to even out the weight distribution as well. I did notice this. Once i bring up the rpm, i see the bow dip down. Then is gets squirrly. The boat moves quite a bit if i move from side to side when someone else is running the boat. Do you know if the older fuel tanks had baffles in them? Seems like it could be a free surface issue. Purchased longer tabs. Hopefully try them this weekend. Any other ideas? Thanks in advance

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              • #8
                I have the same boat. 1987 - 285. Had Yamaha 250 OX66 motors. I experienced the same problem that you are having. I found that, the farther up I trimmed the motors, the better it got. With the motors trimmed down it would roll from side to side and I could not cure it with the tabs.

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                • #9
                  I have had the same boat with 3 different sets of motors for about 12 years. My boat does have a new baffled tank which was an issue in the older ones. They did not come baffled from factory and could cause that listing you are experiencing. It makes a big difference with the baffles.
                  http://i1132.photobucket.com/albums/m568/wilsonmac14/IMG_0595.jpg

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