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  1. #1
    ccsl750's Avatar
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    yamaha 1200 cavitating after pump rebuild

    I have a question ? I had a 1200 yamaha come into our shop for cavitation problems, So we pulled the pump and replaced the wear ring and impeller, put the pump back together and went to water test it , and it still has a cavitation problem! not sure why ? is there something i have missed, i sealed all the parts i took out with sealer ??? but yet it still cavitates please help !!!!


  2. #2
    RIVERA RACING RIVERA RACING's Avatar
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    Did you seal the pump shoe.

  3. #3
    ccsl750's Avatar
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    No but i will in the morning , thanks !

  4. #4
    ccsl750's Avatar
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    was just wondering , was the pump shoe sealed when the ski was new and if it wasn't why did it not cavitate then ?

  5. #5
    RIVERA RACING RIVERA RACING's Avatar
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    seal the pump shoe and check if the cavitation goes away....good luck

  6. #6
    Happily Self-Employed WFO's Avatar
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    what kind of 1200?

  7. #7
    ccsl750's Avatar
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    xl 1200

  8. #8
    Yamaha artisan Cutlass's Avatar
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    what year? 98 has a different pump setup from the 99 and newer

  9. #9

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    Quote Originally Posted by ccsl750 View Post
    was just wondering , was the pump shoe sealed when the ski was new and if it wasn't why did it not cavitate then ?
    Yamaha used a seal that was made out of felt packing between the back of the shoe and the fiberglass hull..... which blew out fairly quickly, that is to say within a couple of years. High water pressure blows them out.

    Air can be sucked from the back of the boat where the shoe,hull, transom and ride plate meet during hole shot, but once water is forced into the intake tunnel when the boat gains speed, the cavitation goes away.

    Use the 3M 4200 and seal the shoe to the hull, especially where the 3 components described and since you have a new impeller and wear ring, your problem should go away. Do not be shy about using to much sealer, just spread it on fairly thick filling all gaps. Bolt the shoe on and torque to specs, and wipe the excess away with any solvent cleaner like acetone, carb cleaner, brake parts cleaner etc. About 24 hrs of curing, especially during this hot Texas heat should be enough to get it done. 48 hours would be even better.

  10. #10
    ccsl750's Avatar
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    tomorrow i will do an inspection of the pump shoe and seal it all , i've done lots of pumps on seadoo's and yamaha's guess i just got lucky in the past, this is the first one thats ever cavitated on me after a rebuild ! great info to know for the future cant thank you enough !

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