650sx intake pump stuffer thoughts or opions?
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  1. #1
    PWCToday Newbie
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    650sx intake pump stuffer thoughts or opions?

    89 650sx thinking about a intake pump stuffer, how does it effect low end power or is it just for top end?
    Last edited by Busterw; 08-21-2018 at 10:07 PM.

  2. #2
    PWCToday.com Is My Home Away From Home Bionic racing's Avatar
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    Re: 650sx intake pump stuffer thoughts or opions?

    Does your sx porpoise and hop a lot ? If so , like they all do it will get worse

  3. #3
    Resident Guru still standin's Avatar
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    Re: 650sx intake pump stuffer thoughts or opions?

    I put the Prowatercraft Pump tunnel stuffer on my X2. now I also changed impeller pitch at the same time so I can't be certain how much effect the stuffer had, but the ski hooks up really well now. Ill be adding the stuffer to my current X2 build as well.

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    Re: 650sx intake pump stuffer thoughts or opions?

    I just installed the ProWatercraft 650sx Pump Tunnel Stuffer on a Kawasaki TS. It fit just like the video shows. https://youtu.be/GyT2N6AJseQ?t=126

    I will report back later with a test ride once the silicone is dry. I also went from a 15 aluminum impeller to a 10/18 SS Skat. The 15 was very clean, the Skat is almost at the Service limit...bought it used.
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    Re: 650sx intake pump stuffer thoughts or opions?

    Got the ski out last night. I upgraded the carburetor to a freshly rebuilt 44SBN and BCW Intake. I did three upgrades at the same time: Impeller, Tunnel Stuffer, and Carb.

    Before, the ski would just spin the prop if you hit the gas from a dead stop. You had to ease into the throttle.

    Now, it just goes at all throttle positions, off or on plane. I didn't check the top speed. Getting closer to 40 for sure, I'll check tonight.
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    Re: 650sx intake pump stuffer thoughts or opions?

    Anyone else have thoughts on the pump stuffer in a 650sx? I am considering one for my jetmate.

  7. #7
    PWCToday Regular SirGodSpeed's Avatar
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    Re: 650sx intake pump stuffer thoughts or opions?

    If you comfortable fiberglassing I recommend epoxy filling for the pump stuffer as you are adding weight at the most critical spot to add weight which will help draw the ski in the water and help it stay hooked up. The PWR stuffer is a good but epoxy fill would be better.
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    Attention ***** PWCToday.com Is My Home Away From Home JonnyX2's Avatar
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    Re: 650sx intake pump stuffer thoughts or opions?

    ^Agree w this. The cost is minimal, the results are proven and noticeable.
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  9. #9
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    Re: 650sx intake pump stuffer thoughts or opions?

    Quote Originally Posted by SirGodSpeed View Post
    If you comfortable fiberglassing I recommend epoxy filling for the pump stuffer as you are adding weight at the most critical spot to add weight which will help draw the ski in the water and help it stay hooked up. The PWR stuffer is a good but epoxy fill would be better.

    I am looking into this as well. Does anybody have a link to a how to? I did a quick search but could not find much.
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    PWCToday Guru stonehenge's Avatar
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    Re: 650sx intake pump stuffer thoughts or opions?

    Quote Originally Posted by Quinc View Post
    Anyone else have thoughts on the pump stuffer in a 650sx? I am considering one for my jetmate.
    Been waiting for someone to try this, hoping they get positive results. I'm building a pump for the jm and the last part I was grappling with is this subject. I called the company, and was surprised how honest they were with me, they stated it should work and should help, however they have never tested a JM nor have they confirmed any sales to JM owners with feedback on the install and test ride.
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