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  1. #1

    250x Engine Help! (Please Read)

    Hi, I recently purchased a 2007 ultra 250x knowing it needed motor work and yes I got it very cheap so no need to say anything like "just part it out"! Now I have a few questions and I'm sure there's a few forum gurus who will probably know the answer to every one (thanks in advance for the answers) I took the engine out and tore it apart knowing that the crank had started to walk forward and broke the teeth off the crank sensor rotor so I knew the crank bearings would be shot. The top end surprisingly was completely fine. Strong compression and even numbers across the top, also the cylinder walls look brand new.

    1. after looking at these pics are these cases junk? Can a engine rebuilder do anything to salvage the cases or no? ****If they are junk will cases of a 260x, st15f, or ultra lx work?****



    2. Now I figured that the crank bearings would be gone but do you guys think I should get my crank refurbished? If so does this look like a good place?http://www.pwcengine.com/products/Ka...xcept-300.html


    3. I know that because my engine decided to eat itself that metal particles went through the oil pump. If you look closely at this picture in the inside of the oil pump you can see these nicks and groves. Should I just replace it?


    4. If everything in my top end looks great and I have strong even compression, I shouldn't change the piston rings right??? tell me if I'm wrong.


    Thanks for all help guys I really appreciate it! IF ANY OF YOU GUYS HAVE 250X CASES PLEASE LET ME KNOW ILL BUY THEM! Oh and here's a pic of my sweet barn find.
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  2. #2

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    With as long as that looks like it ran untill it completely stopped you're look at Cases, crank, oil pump, rods (more then likely) all junk. Better make sure none of that debris made it to the top of the head in the cam grooves. Also check the cylinders out, more then likely have debris all over the walls and embeded in the piston skirts...

    IMO it'd be foolish to replace ALL that and not throw new rings in it. Thats if the cylinder is even still good. Sorry for the bad news, been there, fixed that before

  3. #3
    Quote Originally Posted by MWHC View Post
    With as long as that looks like it ran untill it completely stopped you're look at Cases, crank, oil pump, rods (more then likely) all junk. Better make sure none of that debris made it to the top of the head in the cam grooves. Also check the cylinders out, more then likely have debris all over the walls and embeded in the piston skirts...

    IMO it'd be foolish to replace ALL that and not throw new rings in it. Thats if the cylinder is even still good. Sorry for the bad news, been there, fixed that before
    The cylinder walls look brand new and the camshaft grooves look fine. I'll post a pic of the connecting rods and you guys tell me if I need new. Also piston skirts look good. This guy ran it for only a few min after the light came on and I think that's why the top end is fine. Also I found out why this thing grenaded. NOur it wasn't the pump bearings, but the impeller striped the threads off the impeller shafts and rammed itself and the drive shafts into the crank. Anybody ever had the impeller strip the threads of the pump shafts like this?

  4. #4
    Fat Man, Little Boat Region8Ultra250X's Avatar
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    you might be into it to fix it for more than its actually worth. (I know from experience, I still own one and had one of the early instances of crank walk)

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  6. #5
    Quote Originally Posted by Region8Ultra250X View Post
    you might be into it to fix it for more than its actually worth. (I know from experience, I still own one and had one of the early instances of crank walk)
    I'm in to this thing for 1000$. so I need new engine cases (1,200) remanufactured crank and bearings (400) engine gasket set (300) crank main ball bearing and seals(150?) piston rings (150) updated pump (250). so in total id be into this thing for 3450. aren't they worth more than that?

  7. #6
    11FALLINE's Avatar
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    I managed to salvage a case that sustained damage to the thrust washer area with some tig welding and a bit of machining. It, however had a lot less damage than your's because it appears your bearing holders may also be damaged. That would required a lot more professional machining which may cost more than a used case. It just comes down to whether everything will still have acceptable tolerances between components after the fix.

    But like Region8 said it could still make better sense economically to part it out. Just look at the prices for used heads, cylinders, superchargers, intercoolers and gauge clusters that you have that may still be good parts.

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  8. #7
    Fat Man, Little Boat Region8Ultra250X's Avatar
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    Quote Originally Posted by cklemm View Post
    I'm in to this thing for 1000$. so I need new engine cases (1,200) remanufactured crank and bearings (400) engine gasket set (300) crank main ball bearing and seals(150?) piston rings (150) updated pump (250). so in total id be into this thing for 3450. aren't they worth more than that?
    1.) its worth what someone is willing to pay for it.
    2.) who is doing re-manned cranks and bearings for 400?
    3.) how many hours are on it?
    4.) these are also prone to cylinders heads cracking as well


    just some food for thought as a few of us on here have been there and done that with this particular ski. hate to see you put money into a losing cause

  9. #8
    Quote Originally Posted by Region8Ultra250X View Post
    1.) its worth what someone is willing to pay for it.
    2.) who is doing re-manned cranks and bearings for 400?
    3.) how many hours are on it?
    4.) these are also prone to cylinders heads cracking as well


    just some food for thought as a few of us on here have been there and done that with this particular ski. hate to see you put money into a losing cause
    The link I put in the first is the 450$ reman crank

  10. #9
    And 100 hours

  11. #10
    Fat Man, Little Boat Region8Ultra250X's Avatar
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    Quote Originally Posted by cklemm View Post
    The link I put in the first is the 450$ reman crank

    didnt see the link in the midst of all the photos.



    it's a crapshoot. good luck with it.

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