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  1. #1
    ApriliaRyan's Avatar
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    RPM questions on 05 RXP motor/ ECU in my 03 GTX

    Hey all have a few questions, and have read through and searched a lot, but still unsure I guess. Like the posting says I have an 03 GTX thats been updated with an 05 RXP motor and ECU and several other goodies. First is WOT across the water Im sitting around 7200-7400 rpm and about 60mph give or take. Second is out of the hole I seem to get cavitation but not all the time, when this happens I do see the RPM at 8000 then it returns and hooked up. Ill try to update my sig in a second as to what all is installed so maybe it will help point in a certain direction. Seems like fall has set in again so now water time for a week Im thinking, so good time to dig into this. Even with these issues Im loving this ski, my first 4 stroke.


  2. #2
    Steve-m31164's Avatar
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    Check in the conversion ski section ... You may need the piggy back knock sensor ...

  3. #3
    ApriliaRyan's Avatar
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    ok, I was thinking the same by what I had read.

  4. #4
    YamahaManny's Avatar
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    The gauge on those Skis will only read up to 8k RPMs, I did have the RIVA ECU hooked up to that SKI and it would go to 8k with that ECU, so that knock sensor adapter could be what is missing to get max RPMs from the OEM RXP ECU

  5. #5
    ApriliaRyan's Avatar
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    Ok thanks Manny. I might grAb one and see, not too exspensive.

  6. #6
    YamahaManny's Avatar
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    RPM questions on 05 RXP motor/ ECU in my 03 GTX

    If you are looking to make that ski go faster the next thing to upgrade on it would be an external intercooler, but going this route you may also need to upgrade to bigger injectors like the OEM 48lb ones. I was trying to keep that ski reliable not a speed demon that I would have to constantly tinker with everytime I wanted to ride.

  7. #7
    ApriliaRyan's Avatar
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    Oh don't want speed demon just wanna make sure it's running like it's supposed to. Not sure if it's right or not with that rpm reading is all. Won't know anytime soon , it was just snowing like a sum bitch here lol. Brrrrrrrr

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