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  1. #11
    Riva Stage 1 plus installed, added 2deg wedge and now much drier/stable ride at neutral trim


  2. #12
    Gsmith88's Avatar
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    Quote Originally Posted by gourlb1 View Post
    Riva Stage 1 plus installed, added 2deg wedge and now much drier/stable ride at neutral trim
    speed?

  3. #13
    78.5 top speed, rough lake riding

  4. #14
    Has anyone added aftermarket sponsons to see if makes any difference with the porpoising?

  5. #15

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    That is a good question. I talked to Riva and both the ride plate and sponsons should correct the issue. I was told to run the sponsons in the middle setting.

    Robert

  6. #16

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    sponsons don't touch water at high speed - how can that help with porpoising? I'm shimming whole plate down flush with intake grate - I'll know more tomorrow

  7. #17
    John F.'s Avatar
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    Today I tried a Protec XLT 92mm extended steering nozzle with the Riva ride plate and had some positive results. In neutral and up I was not bouncing but when I trimmed down the nozzle down I was bouncing. I only did a few runs so I need to do more testing.
    I also tried the Protec nozzle with the 2 degree wedge and the ski bounced at all trim positions.
    Currently it has the Riva plate with 4 stainless fender washers, 1 under each bolt.
    Stock gauge is showing 8500-8600 rpm's and 78.6 mph with a little over a half of tank of gas.
    I also was able to pick up 100+ rpm's by removing the outer intake cowl on the hull.
    Last edited by John F.; 10-07-2019 at 05:35 PM. Reason: added info

  8. #18

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    I shimmed the entire riva plate down - still porpoised badly. I installed the Riva intake grate with the riva plate back to stock - it was better - it moved the porpoising up a few hundred rpms' but still too much porpoising. It' is getting closer. I'm thinking of cutting the rear extension off.

    Very disappointing that Riva does not address this issue. You should get what they advertise.

    2019 FX SVHO 76mph at 8400 rpm - scary(dangerous) to ride WFO -

    Good luck to all

  9. #19
    Lake Lion
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    Maybe Riva had GH review a plate massaged by someone. Jerry reported no such anomalies. His findings seemed like this plate was better than a hot chick in yoga pants.

  10. #20
    TJBrad04's Avatar
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    I have the complete Riva stage 2 on my 20' fx and it's stuck like glue at 79mph in neutral trim position. The only adverse handling I saw was bone stock at 70 mph the rear seemed to move around a bit.

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