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  1. #1

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    Question 1200 engine drop in STX 1100 DI hull?

    Let me start with... In california we didnt get the STX-R and i always wanted one. My sister has an 1100 DI that she no longer wants, it runs but they havent had any interest in riding anymore. I have an Ultra 150, runs excellent but the hull is kinda beat up. How does the idea of dropping the Ultra 1200 engine in an STX 1100 DI hull sound? Id love to keep the DI but would surely swap over the carbs if the DI idea is no good. And what about the pump & driveshaft, and any other stuff such as electronics?


  2. #2
    Pump is the same, drive shaft I am not sure.

    Does the 1100di have the same motor mount location as the 150?

    I know the difference between the hulls are the hood area no mirrors, sponsons are different. You can not mount a set of stx-r sponsons on a stx hull. No reverse and the ride plate is different and the seat.

    I think it sounds good, few after market parts and you'll be pretty close. I love my stxr just like I love my ultra

  3. #3

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    Ill have to check if the DI uses 4 motor mounts as opposed to 3 on the Ultra. What worries me most is that the 1200 sits at an angle while the DI engine sits straight up. But i figure the STXR is at an angle so it might be ok

  4. #4

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    U can fiberglass in the new front mounts. Gonna take some work but it can be done. I'm pretty sure the stxr uses a different hull that's lighter also. Be a very cool build I've thought of doing this also.

  5. #5
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    Last edited by jproy; 07-18-2016 at 02:54 PM. Reason: All wron

  6. #6
    steve45's Avatar
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    I wonder it you can bolt the 1200 engine to the STX engine mounting plate.

    If it won't bolt up, perhaps you could re-drill the holes in the plate.

  7. #7
    Engine mounts are not the same, look at the ultra130, the bottom of the hull isnt as deep as the ultra150 im thinking the stx is exactly the same, the 1200 would never sit down correctly. Your better off just buying an stxr

  8. #8
    steve45's Avatar
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    Quote Originally Posted by turboman412 View Post
    Engine mounts are not the same, look at the ultra130, the bottom of the hull isnt as deep as the ultra150 im thinking the stx is exactly the same, the 1200 would never sit down correctly. Your better off just buying an stxr
    I guess that would stand to reason--EVERYTHING on the Ultra 150 is different from anything else!

  9. #9
    DavidR's Avatar
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    Y'all realize you are responding to a 2yr old thread?

  10. #10
    Quote Originally Posted by DavidR View Post
    Y'all realize you are responding to a 2yr old thread?
    yes we do

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