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  1. #1

    Join Date
    Sep 2007
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    c.i
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    13

    stx-15f engine swap

    hi guys have a quick question for u am doing a upgrade on my 04 stx-15 removing old motor an installing a 07 ultra lx 250 none superchared motor do i need 2 use the ultra wiring harness an ecu also or i can use my old harness back any advice would be greatly appreciated


  2. #2

    Join Date
    Mar 2008
    Location
    mississippi
    Posts
    510
    +1
    1
    Quote Originally Posted by islandracer View Post
    hi guys have a quick question for u am doing a upgrade on my 04 stx-15 removing old motor an installing a 07 ultra lx 250 none superchared motor do i need 2 use the ultra wiring harness an ecu also or i can use my old harness back any advice would be greatly appreciated
    You should PM skips313 he will have the answer to that.

  3. #3

    Join Date
    Mar 2010
    Location
    Long Island, NY
    Posts
    505
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    35

    stx-15f engine swap

    It's the same motor, so the 15F harness should do the trick.

    I'd even venture a guess that the Ultra LX harness won't work in the 15F. The Ultra uses a different on/off switch. The 15F on/off switch might not plug into the Ultra LX harness. This might also be the case with the fuel pump.

  4. #4

    Join Date
    Mar 2010
    Location
    Long Island, NY
    Posts
    505
    +1
    35

    Why?

    Just wondering why you're swapping. I would think you'd do the opposite... put a good motor into the newer ski.

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