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  1. #1

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    Cavitation damage in pump, 00' GP1200

    I was in the middle of installing a new impeller and saw what looked like cavitation damage in my pump(see pics). I'm doing the basic performance mods, impeller, grate, ride plate and pump seal. I just want to know if this will make a noticeable difference in performance.

    I posted this on PWCTODAY but I really didn't get the answer I was looking for. Any input would be appreciated.
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  2. #2
    mrbtd's Avatar
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    I would just smooth it out.

  3. #3
    MR. SCOVILLE UNIT SUCKMYWAKE's Avatar
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    if it gets too bad, it will blow that part right out. have had this happen. as a matter of fact, addicted has the pump right now, he welded it back up.it will blow that piece out if it keeps it up

  4. #4
    Welcome to the forum. At this point I wish my pump looked as good as yours.

  5. #5
    Moderator OsideBill's Avatar
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    First off Welcome to the forum

    The picture may not show how deep it is. I would smooth it out if it is surface only. When you re-install make sure you use some sealant between the pump and wear ring also make sure the wear ring is sealed to the transom most guys use Yamabond or equivalent for this.

  6. #6

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    Yeah, I do plan on sealing that all up, thanks. I didn't look like Yamaha used a lot sealer, just enough to make a seal. Is that the best route to go? I just went to put the impeller on and the housing is all jazzed up. The prop won't even turn in there. So should I buy an OEM or after market housing. I ride about 30-40 hour a year kinda hard in fresh water (Lake Michigan). One more question when I turn the shaft by hand it seems somewhat hard to turn, well its not like a bike wheel it doesn't spin real fast. There is no sign of binding and when I took off the old impeller it looked ok.

  7. #7
    Moderator RX951's Avatar
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    welcome to the forum

  8. #8
    spud's Avatar
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    O-Side Bill has a plastic lined liner that has new plastic in it he would probably let go pretty cheap.

    Seal the pump shoe too. That allows a lot of cavitation to happen. They make pump plug kits for that.

    Otherwise get a new liner from boats.net or tha like. In 01 they upgraded the liners with a thicker lining. Skat also will reline your old liner for about the same cost.

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