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  1. #1
    Join Date
    Nov 2019
    Posts
    144

    Default Vibration at initial throttle

    Iíve noticed a quick vibration which seems to be located in the steering column at initial full throttle start to get a surfer out of the water. After a second or two it subsides. Any idea what this could be?

  2. #2

    Default

    I have that too on my 2021 mojo. Itís really noticeable with a full load at take off while the rudder is turned.


    Sent from my iPhone using Tapatalk

  3. #3
    Join Date
    Mar 2003
    Location
    Springfield Missouri
    Posts
    3,297

    Default

    Probably prop wash including cavitation air bubbles passing the rudder when throttling up.
    1998 Mobius
    310 HP PCM
    SOLD

  4. #4
    Join Date
    Mar 2021
    Location
    South Georgia
    Posts
    709

    Default

    My 2021 will do it with a full load when I have the rudder turned full. Straight it does not


    Sent from my SM-G781V using Tapatalk
    2021 Moomba Makai
    Black Cherry Metal Flake & Fire Red
    Nibral OJ 15.5x15 Altitude/Wake prop w/1.76 trans v-drive
    Wet Sounds Rev 8's, 10's, & sub

  5. #5
    Join Date
    Nov 2019
    Posts
    144

    Default

    I donít think itís cavitation, it seems to happen every time now - almost seems like something could be unbalanced? Might be a little less noticeable when rudder is straight for me too

  6. #6
    Join Date
    Jun 2008
    Location
    Henderson, NV
    Posts
    6,624

    Default

    had a few boats that did this over the years and as zabooda calls out, usually due to having the rudder turned while fully loaded up and heavy acceleration.
    if it's happening every time, might check the blade for a ding, rudder or shaft play. had a blade that hit a rock and had a slight vibration to it until fixed that was similar to cavitation and would vary with rpm becoming more and less noticeable as I moved through the rpm range.
    '06 Supra Launch 20SSV-gone but never forgotten

  7. #7
    Join Date
    Nov 2019
    Posts
    144

    Default

    I think this is likely the cause - when you say the blade do you mean the rudder? I bottomed out the boat in a sandy / gravel are right before this started happening.

  8. #8
    Join Date
    Jun 2008
    Location
    Henderson, NV
    Posts
    6,624

    Default

    if you bottomed out, I bet a soda you have a slight tweak in your prop.
    happened to us bottoming out and hitting a small rock. tweaked it enough to do what you are experiencing but was hard to see the slight bend in one of the blades.
    '06 Supra Launch 20SSV-gone but never forgotten

  9. #9
    Join Date
    Feb 2018
    Location
    Boating on Lake Martin, AL
    Posts
    1,188

    Default

    You if you bottomed out likely have a slight bend or Knick in the prop. I had fishing line wrap around my shaft once and it caused all sorts of vibration.

    As far as vibrations or rough steering while turned and heavily ballasted I’d say that’s normal. I try and make a point to not accelerate hard while turning from a stop if loaded down.
    2019 Moomba Max "MOOMBAE"
    Mods: Wakemakers upgrade + 500 lbs of lead
    2016 Yamaha AR192 - sold

  10. #10
    Join Date
    Nov 2019
    Posts
    144

    Default

    Yeah I figured I tweaked the prop a tad . Iíll have it looked at and repaired if necessary over the winter. Thanks for the input as always guys.

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