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Thread: Stx 12f vs 15f

  1. #1

    Stx 12f vs 15f

    What is the difference between the two? Bigger pistons?


  2. #2
    My name is Sean and I am addicted to STXs smokeysevin's Avatar
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    Simply put, a lot, the basic difference is the stroke. All kawasaki 4 stroke PWCs are 83mm bore.

    Sean

  3. #3
    So in theory if I change my head with an Stx 15 head, my engine would displace 1499 ccs?

  4. #4
    Spooling's Avatar
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    If the Stroke is different - it generally means a longer connecting rod and/or different crankshaft.

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    My name is Sean and I am addicted to STXs smokeysevin's Avatar
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    Quote Originally Posted by matsuka.vitaliy View Post
    So in theory if I change my head with an Stx 15 head, my engine would displace 1499 ccs?
    Not even close. The heads are the same.

    Sean

  6. #6
    So would need the bottom end?

  7. #7
    My name is Sean and I am addicted to STXs smokeysevin's Avatar
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    Crankshaft, cams, connecting rods, pistons, intake manifold, throttle body, ecu, wiring harness, temp sensor, cases (maybe), cylinders


    Trust me, you dont want to go through it.

    Sean

  8. #8
    Ah nevermind then. I got the 12f so cheap thought it would be worth it

  9. #9
    My name is Sean and I am addicted to STXs smokeysevin's Avatar
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    If you found a wrecked 15f it might be. Honestly though the difference in price between a 12 and 15f is so minimal secondhand you would lose money in the end more than likely.

    Sean

  10. #10

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    How is the wiring harness different? Is it a different length where It connects to the sensor on the intake manifold? I thought the harnesses were the same?


    Thanks

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