JS300 Cavitation
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  1. #1
    PWCToday Newbie bigler's Avatar
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    JS300 Cavitation

    Jetski cant get up on plane, even with a 130 lb girl trying. motor also doesnt get good water flow for cooling. figuring it is something in the pump. impeller is a little chewed up, pump wear ring area is a little scarred, not looking to spend $200 on this so hoping I can just pick up a cheap impeller to fix most of it. let me know what you guys think, i havent seen enough of these things to know the difference between fine and totally shot.

    20180802_104001.jpg
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    20180802_104046.jpg
    20180802_104053.jpg

  2. #2
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    Re: JS300 Cavitation

    totally shot.
    new impeller time.

  3. #3
    PWCToday Newbie bigler's Avatar
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    Re: JS300 Cavitation

    Quote Originally Posted by restosud View Post
    totally shot.
    new impeller time.
    that is what i wanted to hear, thanks man. anyone else agree?

  4. #4
    PWCToday Newbie
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    Re: JS300 Cavitation

    Hey.
    New to a lot of this so this could prove a learning moment! How can you tell??
    Quote Originally Posted by restosud View Post
    totally shot.
    new impeller time.
    Sent from my SM-G950W using Tapatalk

  5. #5
    PWCToday Newbie
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    Re: JS300 Cavitation

    I've got a 440 and my impeller was similar in condition. It was really hard to get to plane and needed some good balance, a lot of patience, and putting all your weight as far forward as possible. It took forever. Here's a pic showing the old vs new.



    How can you tell? Well, the leading edge is duller than the back side of a butter knife. It's all beat up and bent. And...It's aluminum. I've heard it said before and now, having swapped mine, I agree. If you've got an AL impeller, throw it as far away as you can and bolt on a stainless.

    The stator looks good. The wear area is a little beat up but might be within spec. If you've got the tools available, I'd check the bore diameter. If not, who cares. It may not be perfect but a stainless impeller will surely help.

  6. #6
    PWCToday Newbie
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    Re: JS300 Cavitation

    Wow. Amazing how much of a difference that bit of damage makes!

    Sent from my SM-G950W using Tapatalk

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