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  1. #1

    Seized Ultra 250X

    Hi all,

    I seized my ultra 250x last Friday, I checked the oil as usual prior to launching the ski. I was out for just over an hour racing between to buoys when I noticed a noise coming from the engine / drive train I started to get myself back in slowly when it just died.

    It has 44 hours on the clock and about seven hours use since it's last service.

    I fancy having a go fixing it myself but need to gather information prior to commencing the fix.

    I need to know where to get a proper manual!

    Is there any quick checks I can do to establish the extent of the damage. I had a quick look at the jet pump and can see no damege or debris to my gut feeling is I have damaged the engine somehow. It may not even be worth fixing.

    Any ideas, suggestions or advise would be greatly received.

    Cheers


  2. #2
    www.eastcoastpwc.net Scott's Avatar
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    Pull your pump and verify that your motor is locked up. Very common for a pump to lock up. Good luck


    Sent from my iPhone using Tapatalk

  3. #3
    Thanks Scott.

    I will have a look at it again after work tomorrow and see if I can figure out how to strip the pump out.

    Do I need any special tools for doing so. I also need to know where to get a proper manual, if anyone can let me know where to purchase one online.

    If it is the pump and not the engine I will spend some money on tuning it up as I was ready for the worst.

    The problem with working on anything here is it is so stinking hot.

    Fingers crossed.

  4. #4

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    It's fairly easy. It can be done with the ride plate on, but I think it is much easier with it off. It's just 4 bolts at the rear of the pump area and you ave to remove all of the hoses that connects to it.

    Good luck.

  5. #5
    Thanks again for all the replies. I went out in the heat last night and checked a few things over. I rechecked the oil and it looked new, not black and the dipstick showed an adeqate level.

    I will try and drop out the jet pump tonight and see how I get on. I am feeling a bit better about the situation. Hopefully it will be the pump. If the pump impellar has become seized onto either the Jet Pump Bracket or does it sit inside the vane guide. It is hard to see from the exploded schematic. I would expect this part to be needed replaced too as scoring would likely effect the flow of water through the jet.

    If I have got away with the damage only being the jet pump then I hope to do some engine and handling modifications. I told my wife it would be very expensive to fix so lets just say I have the budget assuming only the jep pump needs repaired/

    I there a dummies guide to tuning the 250x. A lot of the stuff I understand as it applies to cars and bikes too but there is the mention of block offs, wedges etc etc etc. I understand the function and importance of the sponsons and to a certain degree understand the ride plate as this probably relates to the craft trim in the water.

    My budget is not unlimited but I plan on doing a fair bit too the ski. In the order of the most performance enhancement versus cost what should I do.

    Cheers

    Craig

  6. #6
    www.eastcoastpwc.net Scott's Avatar
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    Quote Originally Posted by QatarCraigski View Post
    Thanks again for all the replies. I went out in the heat last night and checked a few things over. I rechecked the oil and it looked new, not black and the dipstick showed an adeqate level.

    I will try and drop out the jet pump tonight and see how I get on. I am feeling a bit better about the situation. Hopefully it will be the pump. If the pump impellar has become seized onto either the Jet Pump Bracket or does it sit inside the vane guide. It is hard to see from the exploded schematic. I would expect this part to be needed replaced too as scoring would likely effect the flow of water through the jet.

    If I have got away with the damage only being the jet pump then I hope to do some engine and handling modifications. I told my wife it would be very expensive to fix so lets just say I have the budget assuming only the jep pump needs repaired/

    I there a dummies guide to tuning the 250x. A lot of the stuff I understand as it applies to cars and bikes too but there is the mention of block offs, wedges etc etc etc. I understand the function and importance of the sponsons and to a certain degree understand the ride plate as this probably relates to the craft trim in the water.

    My budget is not unlimited but I plan on doing a fair bit too the ski. In the order of the most performance enhancement versus cost what should I do.

    Cheers

    Craig
    A step by step guide.
    http://250xtech.com/viewtopic.php?f=46&t=145

  7. #7
    Well after a couple of weeks procrastinating and fear of the findings I braved the heat last night and removed the jet pump.

    Scott was bob on and the issue is the pump it has seized up badly and the impeller and the pump housing are damaged. So I need to figure out what to do.

    I plan on ordering the parts to rebuild it in the next few days. The problem I have is that the manual mentions quite a lot of specialist tools which I just don't have and I am reluctant to buy. What tools out of the required long list are absolutely necessary.

    I intend to replace every part of the pupm apart from the fittings which attach them onto the pump casing. I will replace these gaskets however.

    I also plan on using an uprated impeller, uprated impeller cone, pump wedge which I assume alters the jet angle by 1 degree.

    Any hints and tips on the pump rebuild would be appreciated.

    Cheers

  8. #8
    something I forgot to ask, is the failure in the pump likely to have been caused by the injestion of foreign bodies and it is not likely to have been caused by a drive shaft issue as I do not want to rebuild and trash another pump because I have missed something.

    Thanks again

  9. #9
    nicjak's Avatar
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    sadly you may have trashed the motor aswell very common and expensive best you check your crankshaft thrustwashers also, dont waste your money on a non oem prop or cone, use the money to do the mods so it wont happen again, they are all listed in detail on here.

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