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  1. #1

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    Impeller housing bumps???

    While I have my engine XL800 out and rebuilding the top end and repairing the cases where the piston skirt broke off and polked 2 holes in the cases...due to the oil line coming off, premix from now on..

    Anyway, I noticed the prop wouldn't turn, so with the impeller housing in my hand I notice bumps on the inside of the housing stainless inside preventing the prop from turning freely, one of the bumps had been wore down by the prop.

    What causes these bumps??? And do I have to replace at $200 or grind them down and reinstall???

    Thanks, HB


  2. #2
    100 MILES OF HEAVEN AND I AM SMACK IN THE MIDDLE KEYZBUM's Avatar
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    Quote Originally Posted by havanabama View Post
    While I have my engine XL800 out and rebuilding the top end and repairing the cases where the piston skirt broke off and polked 2 holes in the cases...due to the oil line coming off, premix from now on..

    Anyway, I noticed the prop wouldn't turn, so with the impeller housing in my hand I notice bumps on the inside of the housing stainless inside preventing the prop from turning freely, one of the bumps had been wore down by the prop.

    What causes these bumps??? And do I have to replace at $200 or grind them down and reinstall???

    Thanks, HB
    I just did that job on the parents xl760 I replaced it with e-bay wsm ring with a plastic liner (have not tested yet ) sat we will test it
    and got a used on for the gp1200 from a member here
    mattman

  3. #3
    The bumps on the pump housing happens whenever you dont use the ski for quite a while. I usually just take it off and grind it. if the housing is damaged change it but usually i check the housing first then just grind and put it back and its all good.

  4. #4

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    Wonder if the bumps are caused by a buildup of corosion between the SS liner and the aluminum housing, since I run in saltwater..

  5. #5
    quadzilla's Avatar
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    Lightbulb

    Quote Originally Posted by havanabama View Post
    Wonder if the bumps are caused by a buildup of corosion between the SS liner and the aluminum housing, since I run in saltwater..
    That's exactly what it is Bud..!!!

    There's two or three options open to you..

    1/. Spend the money getting a new liner pressed in..??
    2/. Buy a new part..??
    3/. see if there's a good used part available for sale.. (my preferred option)

    Grinding the lumps and bumps out won't solve the problem..!!
    All you'll end up with is a trashed impeller or the wrong clearance on the wear ring..!!

    Gerry

  6. #6
    Moderator OsideBill's Avatar
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    Quote Originally Posted by havanabama View Post
    Wonder if the bumps are caused by a buildup of corosion between the SS liner and the aluminum housing, since I run in saltwater..
    Bingo this is the correct answer!! The early model liners had issues and Yamaha beefed it up in the later models. The plastic is an inexpensive upgrade or go with a new OEM either it has to be replaced.

  7. #7
    Moderator OsideBill's Avatar
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    Quote Originally Posted by timmy_philson View Post
    The bumps on the pump housing happens whenever you dont use the ski for quite a while. I usually just take it off and grind it. if the housing is damaged change it but usually i check the housing first then just grind and put it back and its all good.

    I do not recommend this procedure. Sorry

  8. #8

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    Thanks again for all of y'alls excellent comments and advice.

    So where do I get a plastic liner, or anything other than paying over $200 for a new one??

    Seems like pressing that thin SS liner out could be a bear...

    My impeller already shows signs of rubbing and wear.

    HB

  9. #9
    100 MILES OF HEAVEN AND I AM SMACK IN THE MIDDLE KEYZBUM's Avatar
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    Quote Originally Posted by havanabama View Post
    So where do I get a plastic liner, or anything other than paying over $200 for a new one??

    Seems like pressing that thin SS liner out could be a bear...

    My impeller already shows signs of rubbing and wear.

    HB
    take alook here http://cgi.ebay.com/ebaymotors/Yamah...QQcmdZViewItem
    not 2 cheap but 25 bucks later to change the wear ring if it wears-out!!!
    mattman

  10. #10

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    i thought about going to the plastic liner. but have heard they dont last long? how long will this last on a rec ski

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