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  1. #1

    Underwater Corrosion

    I am on a very clean fresh water lake in the Adirondack Park, NY. This lake seems to cause more corrosion of aluminum parts that are underwater than surrounding lakes. We recentky had a 97 Yahama where all of the aluminum parts underwater completely disintegrated from corrosion. They literally fall appart in your hand. This is the worst one, however all jet ski's, outboard and I/O motors are also effected to some degree.

    I beliece it is galvanic corrosion due to stray electrical currents. The outboards and I/O's have a sacrificial Zinc plate. I don't think the Jet Ski Mfgr's utalize a Zinc or other sacrificial system.

    I have read that a bad electrical ground could accellerate this condition and this may be the reason why this one Yahama corroded so badly.

    I have no idea how to find a bad ground or other electrical problem, that would cause a stray current and not effect the machines operation.

    The past few years, when I take my Polaris out for the winter, I wire brush off the white product of corrosion and spray paint the area with 100% Zinc paint , then overcoat with a good black paint. I do the same with my outboard and my I/O (not the Zinc). I think this helps

    Although the water is clean, no bacteria and 30 ft visibility it does have a higher conductivity than surrounding lakes.

    Any comments/suggestions??

    Thanks, Neal


  2. #2
    My Jet Ski drinks more than yours Glenozzy's Avatar
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    sacrificial Zinc plate is the way to go.

    you will need to wire it to the block some how and place the plate in the water

  3. #3
    YoYamma's Avatar
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    Quote Originally Posted by neal233 View Post
    I am on a very clean fresh water lake in the Adirondack Park, NY. This lake seems to cause more corrosion of aluminum parts that are underwater than surrounding lakes. We recentky had a 97 Yahama where all of the aluminum parts underwater completely disintegrated from corrosion. They literally fall appart in your hand...

  4. #4
    CHICKA WAH WAH bren's Avatar
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    is'nt there a sacrificial anode in the head of a stock yamaha?

    at the rear of the head in the water jacket ?

  5. #5
    Rocky_Road's Avatar
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    Quote Originally Posted by neal233 View Post
    I am on a very clean fresh water lake in the Adirondack Park, NY. This lake seems to cause more corrosion of aluminum parts that are underwater than surrounding lakes. We recentky had a 97 Yahama where all of the aluminum parts underwater completely disintegrated from corrosion. They literally fall appart in your hand. This is the worst one, however all jet ski's, outboard and I/O motors are also effected to some degree.

    I beliece it is galvanic corrosion due to stray electrical currents. The outboards and I/O's have a sacrificial Zinc plate. I don't think the Jet Ski Mfgr's utalize a Zinc or other sacrificial system.

    I have read that a bad electrical ground could accellerate this condition and this may be the reason why this one Yahama corroded so badly.

    I have no idea how to find a bad ground or other electrical problem, that would cause a stray current and not effect the machines operation.

    The past few years, when I take my Polaris out for the winter, I wire brush off the white product of corrosion and spray paint the area with 100% Zinc paint , then overcoat with a good black paint. I do the same with my outboard and my I/O (not the Zinc). I think this helps

    Although the water is clean, no bacteria and 30 ft visibility it does have a higher conductivity than surrounding lakes.

    Any comments/suggestions??

    Thanks, Neal
    Which Polaris are you riding?

    My MSX 150 has an anode bolted in the pump area....

  6. #6

    Underwater Corrosion

    I have a 95 SLT

    Question to all: How do you find the source of a stray electrical current???
    as this may be the cause of the severe corrosion in the 96 Yamaha

    I am not familiar with any Zinc anodes in any Jet Ski

  7. #7

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    Quote Originally Posted by bren View Post
    is'nt there a sacrificial anode in the head of a stock yamaha?

    at the rear of the head in the water jacket ?
    Yes, my 97 1100 Venture had two small ones

  8. #8
    fx160's Avatar
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    Quote Originally Posted by bren View Post
    is'nt there a sacrificial anode in the head of a stock yamaha?

    at the rear of the head in the water jacket ?
    yes but if the ski is left in the water for long periods
    it also needs one in the pump and ride plate area

    kev

  9. #9
    Can the average hoime garage mechanic add thesee??

    If so, how and where do you get them??

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