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  1. #1

    13 RXPX what to do??

    I picked up a 13 RXPX with 44 hours on the clock. Motor has a knock to it..soo

    My plan is (please let me know if it's feasible) I want an 85mph ski with a SC pump gas maptuner(I want to keep all working options on ski if possible)

    Bottom end
    Carrillo rods
    CP pistons 9.5:1
    ARD studs
    Balanced rotating assembly
    Bearing? OEM?

    Top End
    Full CNC port
    Upgraded Valves,springs, and retainers
    Is a upgraded cam needed?

    Fizzle IC
    Exhaust free flow out the back
    Waterbox?

    Now is is it worth converting to the 300 PTO cover and Supercharger?

    i know there will be other things needed. Just trying to get a list going.

    My other option is to just fix this motor and sell as a stock ski.

    use that money to buy a 300....


  2. #2

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    Turrrrrrbooooooo!!!##

  3. #3
    Quote Originally Posted by Turboted View Post
    Turrrrrrbooooooo!!!##
    Lol I knew that was coming! Maybe next year....

  4. #4
    Site Admin Green Hulk's Avatar
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    definitely go CP 9.5:1 pistons.
    You will want to use OEM bearings. We have them sold as a kit here in the forums store

    If it were my ski, I would do this 300 supercharger conversion kit as your supercharger likely needs rebuild anyway.
    You would also need the PTO modification service while you have it all apart

    The reason I like the 300 supercharger is it uses a much better clutch system and it can be upgraded for even more boost with either the Engine Tech 135mm upgrade, or the big daddy 142mm upgrade

  5. #5
    rxpredviper's Avatar
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    Bottom end ( yes if is need)
    Carrillo rods ( NO )
    CP pistons 9.5:1 ( YES) but no need for 85 mph stock piston will be good to 30psi
    ARD studs (YES) head , cam sprocket, flywheel..
    Balanced rotating assembly ( NO NEED if you only replace piston )
    Bearing? OEM? YES and YES

    Top End
    Full CNC port ( full if is SC and turbo only exhaust side..
    Upgraded Valves,springs, and retainers ( yes and yes
    Is a upgraded cam needed? ( sound hot if you do )
    GO turbo or stay home lol..

    Fizzle IC ( yes)
    Exhaust free flow out the back ( wont give you power but will give you nice sound))
    Waterbox? ( NO) keep stock
    JERRY is the man contact hem

  6. +1 by:


  7. #6
    Thank you guys!

  8. +1 by:


  9. #7
    Couple more questions. I searched but maybe I'm putting the wrong wording in.

    Open loop cooling is it worth changing over to this?

    Rotax Racing driveline? I would love to get rid of the carbon seal and have a sealed carrier like the older 2 strokes ?


    Sent from my iPhone using GreenHulk PWC Performance Forums

  10. #8

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    If you want a solid 85mph px that isn't running on fumes on a cold day, I'd go turbo for sure. If your jumping huge waves and pounding through the waves and need ultimate reliability I'd probably stay with the charger setup.

    rotax setup is sweet but it's a big pain to install and not cheap. Mine has a bit of a vibration at about 4200rpm. I've heard this is common ... but I don't spend time at that RPM. It's nice getting zero water in my ski and knowing I have a bullet proof pump setup. On the the px300 the pump nozzle is beefier so I'd be less worried about breaking it compared to the 260px pump. Still the same shaft that I've heard stories of people running turbos occasionally break.

  11. #9
    ptscon's Avatar
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    If you're not going turbo go 300 charger with ET wheel conversion, you'll be kicking yourself later if you don't

  12. #10

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    Quote Originally Posted by Green Hulk View Post
    definitely go CP 9.5:1 pistons.
    You will want to use OEM bearings. We have them sold as a kit here in the forums store

    If it were my ski, I would do this 300 supercharger conversion kit as your supercharger likely needs rebuild anyway.
    You would also need the PTO modification service while you have it all apart

    The reason I like the 300 supercharger is it uses a much better clutch system and it can be upgraded for even more boost with either the Engine Tech 135mm upgrade, or the big daddy 142mm upgrade
    Can you do the PTO modification and still use your 260 supercharger so you can just bolt on a 300 at a later date?

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