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  1. #1
    clelly30's Avatar
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    Improving HP for a 2008 RXP 155

    Are there any mods that can be put on an 08' RXP 155 to improve its horsepower? Increase its hole shot and overall power?

    Saw a guy today on a Yamaha that said he could do 74mph and beats most seadoo supercharged engines, but put a riva kit in it. Was wondering if I could put a relativley inexpensive addition on mine to get a little more out of it, or should i be looking into the 255 model?


  2. #2

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    I would not waste the money..sell it and get a SC one and modify that if you really want to

  3. #3
    boost junkie skidoochris's Avatar
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    more HP = lots more $$$

  4. #4

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    You could build the motor with lightweight internals and port/polish the head, better pump etc., but you will save money by selling your ski and buying a supercharged model. Forced induction is the only way to make real power. You can get a nice 215 for decent prices these days.

  5. #5
    Mothman's Avatar
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    If you don't ride crazy or take in too much water, remove the stock plastic intake piping and install a velocity stack directly onto the throttle body. Cheap and it'll help a bit. Throw a new wear ring in it too, it'll keep it from cavitating/spinning from a dead stop when you pin it. For real power, they're correct in recommending a sc model. The power/fun factor is a night and day difference.
    Good luck!

  6. #6
    you can mod your 155 not to much upgrades you can do but there is plenty i have a 155 rxp doing 65.7

  7. #7

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    how in the world would you reach 65.7 with 155 ? honestly now... is that on GPS or on the dash ?

  8. #8
    imp0ster's Avatar
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    It's a 215.

  9. #9
    its a 155 and its on gps i can go an take a video too if you would like i have a wedge on it riva intake grate ride plate hole filled impeller ram air front hood modified trim head work done and a torx exhausted spacer and other set up we try doin 65.7 on gps and those are realistic number

  10. #10
    Mothman's Avatar
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    Hell, you could lighten all components, bore it as much as possible, order custom 13:1 (or higher) forged pistons, shave head, use all lightweight valvetrain components, calculate minimum spring tension needed for whatever rpm you're going to run, move battery and any electrical components to the rear, remove weight from hood, monitor tunnel pressure and decrease opening to minimize pressure while maintaining enough for efficient pump use, and a myriad of tiny expensive things to find speed.
    Speed pretty much depends on your wallet. You could shave a shit load of weight from the hull too, if you don't mind the scratchy fiberglass dust. lol

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