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  1. #1
    dlajoy1122's Avatar
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    HELP! I think a cylinder is done for. Need opinions/advice

    So I took the head off my friends 95 spx 657cc engine, and looky what I found.... PTO side looks great as far as I can tell. Nice looking piston wash. Mag side has a ring of grey looking ash. It almost looks like you can touch it/brush it off. and on the dome on the mag side of the engine head, its all coated in silver.

    Is this a blown cylinder? I can feel the uneven surface on the wall of the cylinder. I have never seen one before. lol If so, can I just replace the one. My uncle can bore the cylinder and replace the piston. Or do you experienced people not recommend replacing just one.

    Also, what exactly would I need? Can someone help me out here. I need to know exactly what to buy. I would be so appreciative if someone could tell me all the stuff I need.

    Thanks a million. Ps. sorry for the bad quality pictures.

    Fried MAG side
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    PTO side
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    Left side is PTO, Right is MAG
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  2. #2
    flyin' the friendly skies airbornexp's Avatar
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    Yep, that's toast. Order new pistons and have the walls honed depending on how bad they are. You may get away with a hone and some larger rings or you may have to do a 1x with a bore. Either way I would dismantle the whole thing and clean out the crank case of all debris and clean the crank down. If you have the money buy. New crank or have your uncle separate the crank and replace the seals. Find a new or used head too that ones done

  3. #3
    dlajoy1122's Avatar
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    Quote Originally Posted by airbornexp View Post
    Yep, that's toast. Order new pistons and have the walls honed depending on how bad they are. You may get away with a hone and some larger rings or you may have to do a 1x with a bore. Either way I would dismantle the whole thing and clean out the crank case of all debris and clean the crank down. If you have the money buy. New crank or have your uncle separate the crank and replace the seals. Find a new or used head too that ones done
    Should we do both cylinders?

  4. #4
    flyin' the friendly skies airbornexp's Avatar
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    Don't have to but I would

  5. #5
    dlajoy1122's Avatar
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    Quote Originally Posted by airbornexp View Post
    Don't have to but I would
    Ok I will recommend doing both. It makes sense. fresh top end rebuild.

    Also, what do I order?.... or do you not know because its the sort of thing you need to see how bad the damage is... etc...


    On SBT it gives options..
    http://www.shopsbt.com/seadoo-jet-sk...gs/47-103.html
    STD
    0.5mm
    1mm etc.? I'm not sure. My uncle will be doing it with me and walking me through it but I just need to know what to order.

  6. #6
    canuck's Avatar
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    You also need to find the cause of the failure not just fix the symptoms.

    Check the oil lines and pump, rebuild the carb or carbs, if it has gray fuel lines replace them and make sure the fuel system is spotless.

  7. #7
    dlajoy1122's Avatar
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    Quote Originally Posted by canuck View Post
    You also need to find the cause of the failure not just fix the symptoms.

    Check the oil lines and pump, rebuild the carb or carbs, if it has gray fuel lines replace them and make sure the fuel system is spotless.
    Im guessing the cause is the grey fuel lines and the carbs clogged. His seadoo has been running horrible for years. I offered to redo his entire fuel system and clean his carbs (rebuild if necessary).

    One question though, how do you know if an oil pump is working?

  8. #8
    dlajoy1122's Avatar
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    Quote Originally Posted by dlajoy1122 View Post
    Quote Originally Posted by airbornexp View Post
    Don't have to but I would
    Ok I will recommend doing both. It makes sense. fresh top end rebuild.

    Also, what do I order?.... or do you not know because its the sort of thing you need to see how bad the damage is... etc...


    On SBT it gives options..
    http://www.shopsbt.com/seadoo-jet-sk...gs/47-103.html
    STD
    0.5mm
    1mm etc.? I'm not sure. My uncle will be doing it with me and walking me through it but I just need to know what to order.
    Can anyone help me with this question?

  9. #9
    flyin' the friendly skies airbornexp's Avatar
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    Your uncle will know. Take the cylinders to him. If the scratches are deep enough to get a finger nail caught on its going to be a once over. If they are light scratches its a quick hone. Then You can order piston sets from Pro X or WSM. They come with rings, wrist pins and clips. If you order a crank it comes completely assembled with rods.its a drop in.

  10. #10
    dlajoy1122's Avatar
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    Quote Originally Posted by airbornexp View Post
    Your uncle will know. Take the cylinders to him. If the scratches are deep enough to get a finger nail caught on its going to be a once over. If they are light scratches its a quick hone. Then You can order piston sets from Pro X or WSM. They come with rings, wrist pins and clips. If you order a crank it comes completely assembled with rods.its a drop in.
    Thanks for your help.

    If we're going to be doing all of this, do I have to completely remove the entire engine? Or can I just remove the top end? Hope thats not a stupid question... lol

    ALSO I forgot to ask, last question...for now... is that engine head good still? Seeing as the dome is covered in silver flakes from the piston/cylinder wall being shredded?
    Last edited by dlajoy1122; 08-16-2013 at 11:02 PM.

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