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  1. #1
    mjh3ides's Avatar
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    DO NOT blueprint the grate to the transom plate on a SHO!!!

    After hearing good results from this on the FZ's, I opened up the sides of shoe section of the grate to match the ID of the transom plate & got nothing but an incurable buck. It allows more water to enter the pump & causes it to overstuff. The pic shoes how it looked before I opened it up.

    After it happened with the stock ECU with a modded R&D plate, I put on my modded stock plate(less angle), a shorter prop, bigger nozzle ring, reflashed ECU & put the stock pump cone back in. It still bucked at the same speed(69mph), and felt real loose & sqirrely as the speed went higher. I could install pressure reliefs, but IMO that's a bandaid & it might start to happen again at higher speeds...not woth the risk.

    I guess Riva made it like that for a reason.
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  2. #2
    hitman's Avatar
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    Good info Mark. I was kind of baffled whe Eric told me about it. Glad you found the culprit.

  3. #3
    JD 1's Avatar
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    Quote Originally Posted by mjh3ides View Post
    After hearing good results from this on the FZ's, I opened up the sides of shoe section of the grate to match the ID of the transom plate & got nothing but an incurable buck. It allows more water to enter the pump & causes it to overstuff. The pic shoes how it looked before I opened it up.

    After it happened with the stock ECU with a modded R&D plate, I put on my modded stock plate(less angle), a shorter prop, bigger nozzle ring, reflashed ECU & put the stock pump cone back in. It still bucked at the same speed(69mph), and felt real loose & sqirrely as the speed went higher. I could install pressure reliefs, but IMO that's a bandaid & it might start to happen again at higher speeds...not woth the risk.

    I guess Riva made it like that for a reason.
    I wonder how much faster it would go with the tunnel narrowed?

  4. #4
    THE PLATE MAN JIM'S PERFORMANCE's Avatar
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    Quote Originally Posted by JD 1 View Post
    I wonder how much faster it would go with the tunnel narrowed?
    Probably will gain a good amount of top speed but you will pay for it in holeshot.

  5. #5
    Bounty Hunter Carlos Thomas's Avatar
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    I still don't know what "blueprinting" actually means. One day I will muster up enough courage to ask...

  6. #6
    yami_rida#26's Avatar
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    Quote Originally Posted by Carlos Thomas View Post
    I still don't know what "blueprinting" actually means. One day I will muster up enough courage to ask...
    It's when you file down & sand all the imperfections in your pump to make it completely smooth so you have a smooth flow of water through your pump=increase in performance.

  7. #7
    Quote Originally Posted by Carlos Thomas View Post
    I still don't know what "blueprinting" actually means. One day I will muster up enough courage to ask...
    Blueprinting is a fancy word for measuring and recording...
    When you balance and blueprint an engine, you simply balance the reciprocating assembly and then measure every clearance and record it on paper, just as a blueprint is on paper..
    You then have a blueprint of your engines clearances for future reference.

  8. #8
    Addicted Member 5001craig's Avatar
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    Wonder if an adjustable grate (like a TBM) would be able to cure this problem with the ability to "load" the pump more by lowering the scoop?

    Too bad they only make them for the FZ-series skis presently.

  9. #9

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    Quote Originally Posted by hitman View Post
    Good info Mark. I was kind of baffled whe Eric told me about it. Glad you found the culprit.
    Didn't believe me huh?? lol.

    I was riding next to him when it happened. I'ts not violent, but iyou know iwhen t happens.

    Quote Originally Posted by 5001craig View Post
    Wonder if an adjustable grate (like a TBM) would be able to cure this problem with the ability to "load" the pump more by lowering the scoop?

    Too bad they only make them for the FZ-series skis presently.
    +1

  10. #10
    Boilerman Bill BPnta's Avatar
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    Quote Originally Posted by mjh3ides View Post
    After hearing good results from this on the FZ's, I opened up the sides of shoe section of the grate to match the ID of the transom plate & got nothing but an incurable buck. It allows more water to enter the pump & causes it to overstuff. The pic shoes how it looked before I opened it up.
    Great info there thanks for pointing it out.

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