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Nissan NS40C issue. Need help/advice pls!

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  • Nissan NS40C issue. Need help/advice pls!

    Hi all. Posted this over in propellers as well, but it may not be a prop issue so I'm posting here as well.

    I just purchased a 2016 Grumman Cayuga 16 16' aluminum fishing boat with a 1994 Nissan NS40C manual tilt motor with a 12" pitch prop.

    I am a big guy and weigh in at 450 lbs, so needless to say with 1 to 2 passengers, fishing gear, boat gear, motor, gas tank, and all it comes out to around the 1200 lb capacity.

    I bought an induction tach (with the wrap around the ignition cable wire) and it reads 960(ish) at idle after warm up. When at WOT, the average RPMs for two runs in opposite directions was 3150 and 3500.

    I just can't seem to get on plain.. with a passenger in the front it goes at a top speed of 13 mph, and with the at the rear it tops out at only 8mph.

    The engine seems to run fine so I am thinking it may have to do with the way the person who put the motor on installed it, or the way I have it manually trimmed in the water. Ive been keeping it trimmed down at the 2nd bolt hole from the transom when it's in the water.

    Again, I'm new to boating so don't know if this is just too low, or if maybe I should go with a new 8" pitch 4 blade prop to get RPMs up to around 4k. The manual says it should be closer to 5500...

    I can take pics or try to perform any tests, but I'd like some with more experience to chime in if possible as to what I should do next. Thank you in advance!

    Attached Files

  • #2
    The pic in the post is to show the AV plate as it sits in relation to the bottom of the stern.

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    • #3
      This shows how the motor sits when I'm in the water from a wide angle.
      Attached Files

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      • #4
        And lastly, this is to show how I have the motor trimmed.
        Attached Files

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        • #5
          You've come to the right place, this PDF file will help you re install that nice M40C : If something it's not clear, simply ask. Let me know if was possible to open it, if so better download the PDF file as will be online 10 more days..

          https://jmp.sh/k4ByUsP

          Happy Boating


          Sea Rider 320, 380 Sibs, 450 Rib, 2 Strokes Tohatsu 5,18 & 30 HP Proud Smokers

          Comment


          • #6
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            Sorry could not read completely your posted answer via the inbox as the page is flashing crazy. All clamp screw motors have 2 upper clamps and 2 lower bolts which are used for securing the motor to the transom. Some users bolts their motors, some don't.

            You can bolt your motor to the transom once the water flow exiting the boat's rear bottom has been well matched under the upper water deflector plate. Did you understood well what was explained in the PDF Review ? If so, try to duplicate this live video with your motor : https://www.youtube.com/watch?v=oBeZ...ature=youtu.be

            Happy Boating


            Sea Rider 320, 380 Sibs, 450 Rib, 2 Strokes Tohatsu 5,18 & 30 HP Proud Smokers

            Comment

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