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  1. #1
    quiddo15's Avatar
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    Les cooke C kit! Need help!

    So I'm trying to find the issue with my ski maxing out at 74mph @ 8400rpm air temp 34 degrees in flat fresh water
    This is my setup
    Rxpx 2009
    Les Cook C kit, I've been told it's putting out 19psi at the manifold
    4inch air intake- Seadoo centre
    Titanium Valves- Seadoo centre
    Ported and polished heads- Seadoo centre
    Bored throttle body to 60mm- Seadoo centre
    Aluminium race manifold- Seadoo centre
    Low compression pistons- Seadoo centre
    Garret intercooler- Seadoo centre
    Pump relief valve
    Race sponsons
    R+D auto drop nozzle
    Riva water box
    Riva catch can
    Riva thru hull exhaust
    Open loop cooling
    thermostat
    60lb injectors
    Walbro fuel pump
    Rrfpr
    Motec M400 Ecu rev limiter 9100rpm
    Opas block offs
    Stainless steel wear ring
    Skat track 14/18 3 blade
    And i'm running a stock grate as I was told it's the best for my setup.
    I would love for some input from the ski Gods!
    Last edited by quiddo15; 02-27-2013 at 04:06 AM.


  2. #2
    West Texas RXP skoepp's Avatar
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    What rpm?

  3. #3
    SLASHER's Avatar
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    U should be at 80 mph easy ...

    That prop is holding u back , also what rpm u getting ...

    I have had 2 C kits and never seen pass 16 psi

  4. #4
    quiddo15's Avatar
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    I just edited the post, 8400rpm in fresh water, air temp 34 degrees. A guy called Garry Watson from Watsons racing put the m400 motec ecu in and tuned it, he told me it has about 19psi at the manifold. The acceleration is definitely there but speed is not. I was expecting a lot more out of the c kit. What prop would you recommend with this setup without losing too much acceleration but getting me around the 80mph?

  5. #5
    West Texas RXP skoepp's Avatar
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    Ditch the stock grate.
    Not saying that's your issue but it is holding you back and you don't want to have a yard sale.

  6. #6
    SLASHER's Avatar
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    R&d grate and a Solas 22 and repitch to rpm ...

  7. #7
    Moderator Snoman's Avatar
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    I would start by getting rid of the stock grate and the 14/18 3 blade and going with a 15/20 repitched for the RPMs you are looking to get...

  8. #8
    Water4fire's Avatar
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    First question before we all tell him what to get rid of.
    What is the ski going to be used for?

  9. +1 by:


  10. #9

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    There is a good chance your ski is not making the power it should be at this point. A true 14/18 skat on a stock 87 mm nozzle is a very small load on your setup-- I would think with your mods it could and should pull it to 9000+ rpm-- unless it has been tweeked. Putting a 15/20 concord on your setup and expect to loose a significant number of RPM. But I agree with the others that the 4 blades (pitch correctly, nozzled correctly, coned correctly, drive line setup done correctly) is the way to go.

  11. #10
    rxpdoo's Avatar
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    You should first verify the boost. If you don't have a boost gauge you should definately get one especially with the mods you have. This will help you rule out if you have a s'c with a slipping clutch or a loose hose , because the rpm does not match the speed. Re-varify the exact pitch of the prop,most are not what they say they are. What reduction nozzle size are you using ?

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