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Right Prop for Yamaha 115 4 Stroke

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  • Right Prop for Yamaha 115 4 Stroke

    I have a 2005 Sea Swirl 19.5 Ft. Boat with a Yamaha 115 4 Stroke on it. The boat is very slow planning out with 4 people and only tops out at 38 mph @ 4900 rpm. It does not throw a rooster tail but spays out the sides. What prop should I use for better planning and speed ?

  • #2
    Re: Right Prop for Yamaha 115 4 Stroke

    We need to know what prop's on it now to help. This 18-1/2 ft is hitting 6000 RPM and 37 MPH with a 17P prop. You definitely need to get your max RPM up at least close to 6K with a drop in pitch. I doubt you'll get more top speed, but you'll sure improve holeshot and planing speed. A 115 seems a tad small for a 19-1/2 footer.
    Bryant 214 Limited/FI 5.7
    Ranger 1850VS/Yamaha F150


    • #3
      Re: Right Prop for Yamaha 115 4 Stroke

      Motor is a little small.

      Your tach can't be reading right.
      "Doris", 2007 Stanley Islander 19, Yamaha F150


      • #4
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        Re: Right Prop for Yamaha 115 4 Stroke

        Considering the size of the boat your speed is pretty good.Is it by GPS?
        I to wonder about your tach/rpm and prop size.Size usually appears under the prop nut or on the barrel.