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  1. #1
    spud's Avatar
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    Riva Ride Plate Angle Modding

    O'Side Bill and I are working on a Riva plate (1300) to see what we can get Baby Jet Ski to do with a stock 1200. Total different animal from a R&D 1200 plate. I had to grind a lot to get it to fit with 1.00 offset from the pump. One little thing that sneaked up on me was my trim wouldn't work. I had to make a clearance cut for the bolt head.

    Next time out I'll take some shims and get the plate set up. After I get over 70 in the books with a stock engine. Baby Jet Ski gets a 1300 powervalved top end and traded for a Kawi STXR that has 10 hours on it. That will make a good ski to give my daughters rides on. My friend is excited about getting a hot rod. I imagine it will probably run 74 or so with the Nu-Jet and old pump.
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  2. #2
    spud's Avatar
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    I have some other plates to test too. I'm starting at 1.00" then shimming from there.

    I put a 2" extension on the 1390 project. What a bitch if you want to maintain a .950 plate angle, or have it so you have the ability to go to .950" I used the grinder on the pump and plate for 1.5 hours. Its all good now. The 1390 is just waiting for the Black Jack 48's then she'll be on the water.
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  3. #3
    Moderator RX951's Avatar
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    sweeeet

  4. #4
    All hail the Chief! fullboogie's Avatar
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    Good info Jim. Keep us posted on how this works out.

  5. #5

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    I have had good luck with this plate. It does take A LOT of grinding, smoothing, and sanding though!

    good luck!

  6. #6
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    Looking great Spud! Can't wait for that 1390 to hit the water.

  7. #7

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    Spud,

    That picture of the cut plate is what I've had on my mind for the past few days. The only difference is that I would use a 3 degree for stability. The idea from my way of thinking is that for maximum thrust efficiency, the thrust should come in contact with the water the moment it exits the nozzle rather than 2-3 feet behind the boat.

  8. #8
    mrbtd's Avatar
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    @ some point doesnt the bottom of the steering nozzle and bolt create drag ?

  9. #9

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    Generally I ride in 2-4 foot chop. My concern has always been that if the boat were to jump a wave and land tail first that a shortened plate would allow for the water to catch the swing bucket and tear it off. If you landed in shallow water, you could break or bend your venturi. I've seen this happen to a few old 95-97 Sea Doo XP's. They were quick and nimble for this design, but for sure it was a down side for them in the surf.

    The "ride plate" from my understanding was originally called a "pump cover" and used to protect the pump. The futher that pump sticks out away from stern (end of the plate) and still in close contact with the water the better the effeciency should be with a shortened plate. This is at the expense of protecting your pump.

    Spud, I sure hope this works out. It will be taking it to a new level.
    Last edited by salty; 08-27-2007 at 09:53 AM.

  10. #10
    spud's Avatar
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    I'll let you all know how the plate performs. Bill machined enough off so we could shim up. We were hoping to be past the sweet spot so we can find it with shims.

    Its easier to grind that plate than grind the pump for a 2" extension.

    I'm excited about the STXR. Sweet family ski. Don't need much range. Just for putting around with kids.

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