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  1. #1

    Ultra 150 engine rebuild

    Hi Guys...

    I have 2 options to repair my ski:

    1) Buy remanufactured motor from SBT for approx $2k

    2) Buy a used complete shortblock with 90 hours, and use the parts from my original ski. All parts are in great condition (less than 45 hours).

    What would you reccommend?

    Is the Ultra engine difficult to work on and adjust once rebuilt if I choose to do the work myself? Anything I should know prior to taking on this project? Also, in addition to the shop manual, is there any other resource to help with the install and initial start up?

    Thanks!


  2. #2
    btldigger's Avatar
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    I would stay away from the sbt motor. Building it yourself isnt hard the manual will walk you rite thru it. What went wrong with the original motor?

  3. #3
    Moisture got inside one of the cylinders, causing the piston to crack and blow out of the crank case. 2 heads/pistons and all other components are perfect.

    Could buy this used shortblock with 2 heads, crank and starter, use one of my old heads and put the engine back together and run it? Is there anything special that's needed to be done, like machine the head to make it fit with the others?

    Thanks!

  4. #4
    btldigger's Avatar
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    No nothing special. I would probably have a look to be sure it didnt have the same failure yours did. I would split the cases to be sure they are clean and there is no debrise in the crank bearings. Probably would go ahead and do new pistons while I was in there.

  5. #5
    axgrider73's Avatar
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    Rebuild it your self. The only thing that you might consider sending out is the crank.

    Let us know what you decide.

  6. #6

    Join Date
    Dec 2006
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    Rebuild it yourself.

  7. #7
    Thanks for the tips guys...i'm going to take on this project myself.

    Is this as simple as buying a new/used crankcase, head and piston, bolting it all together and running it? The engine does not seem that complex, I can have the crank sent out for some bearing work, have the carbs rebuilt...but what else is needed?

    Should all new rings be installed on the pistons? Is there any trick to this, or just go to the dealer, buy a set of rings and place them on?

    I'm really a noob at this so any help is greatly appreciated!

    Thanks

  8. #8
    axgrider73's Avatar
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    Do you have the manual? If not it can be found in the tech section.

  9. #9
    Yeah I have the manual...going to follow that very closely as I rebuild

  10. #10
    gtxscrider's Avatar
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    May 2007
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    Quote Originally Posted by Mack77 View Post
    Hi Guys...

    I have 2 options to repair my ski:

    1) Buy remanufactured motor from SBT for approx $2k

    2) Buy a used complete shortblock with 90 hours, and use the parts from my original ski. All parts are in great condition (less than 45 hours).

    What would you reccommend?

    Is the Ultra engine difficult to work on and adjust once rebuilt if I choose to do the work myself? Anything I should know prior to taking on this project? Also, in addition to the shop manual, is there any other resource to help with the install and initial start up?

    Thanks!
    Definetly stay away from sbt. Ive been having trouble getting full rpms from one of their ultra 150 engines with only 90 hours on it.

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