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  1. #1
    My Boats:
    2006 Nortech 3900V w/ Eddie Young 700EFIs
    Join Date
    Jul 2009
    Fredericksburg, VA

    Prop Shake/Vibration Question

    New to me 2000 Fountain Lightning with 500EFIs, non staggered, stock length lowers, 29p Hydro Quad IVs. Boat runs excellent, very happy with it. A time or two when getting on plane I had noticed a very slight vibration... occurs and disappears in about 1 second... nothing I had worried about.

    However, this past weekend I was loaded heavier than I had been, lots of fuel, cooler, people, etc. I noticed it 4 or 5 times yesterday. I will be trimmed all the way in (tabs all up, or all down, doesn't matter). Just as the boat begins to lay over I get a little shaking. It either clears up as soon as the boat lays over or the minute I begin to trim out. It lasts 1, maybe seconds. It's pronounced enough that my passenger felt it. There is no noise that accompanies it, and I can trim all the way back in while running at speed and it doesn't re occur.

    The boat is new to me, 177 hours, and seems to have been well maintained however I cannot speak for the condition of any of it's components.

    Is this an area of concern? Is this prop shake? If so what causes it? It doesn't do it EVERY time, and it's not severe, but enough to notice. Any ideas guys?

  2. #2
    Charter Member # 55 Charter Member Griff's Avatar
    My Boats:
    ..........32........... Active Thunder
    Join Date
    Oct 2000
    First thing to do would be to have the props perfectly balanced by a good propshop.

  3. #3
    My Boats:
    2005 288 Sunsation
    Join Date
    Feb 2008
    Englewood, Ohio

  4. #4
    Just Milkin' It Platinum Member Kelly O's Avatar
    My Boats:
    09 35 Fountain Lightning
    Join Date
    May 2004
    Auburn, New York
    Props are cavitating while boat is nosing over onto plane. Depends on water conditions, weight distribution, boat settings.
    My 03 35 Lightning would do it occassionally. Good idea to have props balanced but this will likely still occur for a few seconds until props get into better water.
    HOLY COW !!

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