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  1. #1

    Stx15f project need a 155mm pump

    I am building a 11' jet boat and using everything from a stx15f. I read on here (green hulk) that a 155mm pump is a bolt on upgrade. Anyone had any experience in the long term use? Any major problems? Does anyone have a pump for sale? I have an ultra 150 pump to trade or ?? Thanks!
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  2. #2
    My name is Sean and I am addicted to STXs smokeysevin's Avatar
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    You will need the ultra lx pump, and prop. Why do you want the 155? Have you worked the pump tunnel or shoe over, if not its going to hurt the performance a lot.

    Sean

  3. #3
    I built the tunnel from scratch, it's good I will need to take a little out of the shoe but that's not a problem

  4. #4
    My name is Sean and I am addicted to STXs smokeysevin's Avatar
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    What are you hoping to gain by swapping the pump?

    Sean

  5. #5
    Hoping to plane out in less time - distance not sure if its achievable but was hoping.

  6. #6
    My name is Sean and I am addicted to STXs smokeysevin's Avatar
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    Simplest way to do that is to open up the exit nozzle a little bit.

    Sean

  7. #7
    So your really not gaining anything with the bigger pump?

  8. #8
    My name is Sean and I am addicted to STXs smokeysevin's Avatar
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    Not wothout making more power.

    Sean

  9. #9
    Racer kawasaki15f's Avatar
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    I have a 155 setback magnum 12 vein with long nose prop. I've never had a problem using these pumps al long as you check and/or replace the bearings on a regular bases

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