Crank case damage and repair question
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  1. #1
    PWCToday Newbie ad550's Avatar
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    Crank case damage and repair question

    Last spring I built a 550sx reed valve motor with all the goodies - lightweight flywheel, forged pistons, high compression, advanced timing, SBN44 carb, etc. I updated everything except the crank and surprise surprise, had a crank bearing failure after about 60 or so hours of use. I am planning on getting a new crank, sleeves, pistons, etc. and rebuilding the motor for next summer but Iím unsure of what I should do with my crankcase. Iím assuming these scratches are going to affect my engine performance. Is there a way that I can get them repaired? Does anybody on here have a set of clean 550 reed valve crank cases for sale?
    71844ADA-DB5B-4EAC-A122-BD9B9F8FCCD4.jpeg2631D6DB-EA1B-4178-822C-8565C24026C5.jpeg6EC31D07-3105-477B-BCD8-13B58DDC5363.jpeg

    Thanks in advance for the help

    -Alex

  2. #2
    PWCToday.com Is My Home Away From Home wmazz's Avatar
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    Re: Crank case damage and repair question

    Test your crank case for low spots where the connecting rod slammed against the
    cases. If you do not have a flat plate you can use, I can help you make one from
    3/16" glass from your local hardware store.


    Bill M.



    550sx bottom case.png
    Last edited by wmazz; 11-25-2020 at 03:00 AM.
    Horsepower == Speed, RPM != Speed



  3. #3
    PWCToday.com Is My Home Away From Home wmazz's Avatar
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    Re: Crank case damage and repair question

    Quote Originally Posted by ad550 View Post
    high compression
    How high? The 550 reed came with 175psi stock.


    Bill M.
    Horsepower == Speed, RPM != Speed



  4. #4
    PWCToday.com Is My Home Away From Home Myself's Avatar
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    Re: Crank case damage and repair question

    Those scratches are nothing. Literally don't even think twice about them. Rub cases on flat surface to check for "true", then put 'er together.
    http://www.facebook.com/twinlakesjetskirepair

    '89 Kawi 650SX 42.4 GPS
    +3" stock pipe, ported ex. manifold, drilled waterbox, blueprinted pump, Ocean Pro ride plate

    '99 Yama GP1200 65U 61.8 GPS
    ported cylinders, matched cases, milled head, blueprinted pump, long ride plate

    '96 Seadoo HX 717 53.13 GPS
    light porting, massaged cases, lightened flywheel, port matched manifolds, Rossier pipe, stubby pump cone

  5. #5
    PWCToday Newbie ad550's Avatar
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    Re: Crank case damage and repair question

    Thanks for the advise!!

    -Alex

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