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  1. #1

    Join Date
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    How Much Longer?

    My 2001 SLX1200 if now painted, on the water almost dislocating my arms, but the porpoising is terrible. It's got a R&D intake grate and the ride plate appears to be standard. I've tried to find someone here in Australia with a longer plate, but no luck there. While I am trying to locate one from elsewhere, I've toyed with the idea of welding up my own or extendng the one that's on there.

    Problem is I don't know how much longer I should go. The one on it is 405mm long, so how much longer should I go?


  2. #2
    PolarisNut's Avatar
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    What wedge are you running? The standard 4*? May want to try a 2* for surf riding

  3. #3
    Click avatar for tech links/info, donation request K447's Avatar
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    Another Greenhulk member extended his SLTX ride plate. The SLTX is a three seater hull, so it is more stable on the water to begin with.

    You could weld a significant extension length to your ride plate, then trim it back if you find that it is too much.

    The Ocean Pro 'Ocean' ride plate is a well regarded commercial extended ride plate, and I believe they are still available new from the manufacturer. The O version is longer than the R version, and therefore better for reducing porpoising.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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  4. #4
    FLjoyrider's Avatar
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    is your trim working???

  5. #5
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by FLjoyrider View Post
    is your trim working???
    That is not my machine.

    But I don't see why the trim wouldn't still work. Looks like enough clearance under the nozzle.

  6. #6
    AWA Member 32DegH2O's Avatar
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    Quote Originally Posted by K447 View Post
    Another Greenhulk member extended his SLTX ride plate. The SLTX is a three seater hull, so it is more stable on the water to begin with.
    Actually it's an extended SLX ride plate. I took 2 stock SLX ride plates and welded them together and it gave me an extra 4" to the length. The Ocean Pro - "O" plate is 2" longer than stock and has more surface area in the back than stock...makes good improvments. However, it didn't get totally get rid of my porposing so that's why I tried welding 2 plates together...it worked great and boy did it help getting out of the hole and up on plane.

  7. #7

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    Just a couple of quick answers: Yes the trim is working, but it has virtually no effect on the problem (weight way forward helps a tiny bit) and the wedge looks like a 4* to me.

    After a promising start, I've had no further replies from ocean pro, don't know what the issue it there!!

    What to do....what to do

  8. #8

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    Jan 2010
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    Here's some pics of the problem area
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  9. #9
    Click avatar for tech links/info, donation request K447's Avatar
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    What intake grate is on your hull?

    How smooth or rough is the water you normally ride on?

    Does a full fuel load affect the porpoising much?

    Check that when the trim down button is pressed, the trim nozzle actually goes down, not up. And the MFD display should agree with the actual position.

    Tip: Hold the bilge button to enable the trim motor when the engine is not running.

    Slide the hull back on the trailer (and make sure it is secured there), and have a look at the bottom of the hull where the ride plate meets the intake grate.

    I am wondering if your ride plate is poorly installed or not smoothly aligned with the bottom of the hull

    A straight edge held against the hull should show the ride plate to be in the same plane as the hull bottom, on both sides and the center area.

  10. #10
    When I had a slxh it porpoised even when sitting up as far as possible. I put on a 2 degree wedge with the stock plate which helped a lot.

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