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  1. #1

    stx 12f/15f piston ring replacement

    Can the piston rings be changed without pulling the motor from the ski?

    I have taken it down enough to be able to pull the cylinders off the pistons but my concern is being able to get the pistons and new rings back into the bore. If someone has done this it would be greatly appreciated on how you were able to do this.


  2. #2
    I was using the piston-ring compressor tool and had to remove the engine from the ski because the tool would interfere with the deck of the ski.

  3. #3
    nicjak's Avatar
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    i usually install the pistons and cylinders on the bench then lift the motor into the ski and fit the head and rest in there my only reason you dont need a crane to lift the motor in or out arms do it nicely

    the rings are easy to damage i wouldnt try in the ski.

  4. #4
    My name is Sean and I am addicted to STXs smokeysevin's Avatar
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    You can get the rings into the jugs without the tool it's just a pain in the ass. I did mine on the bench as well, makes checking the timing easier.

    Sean

  5. #5
    so.... see some of my other posts... still having problems. I am definatly going to need to change the pistons and rings. Please Please Please give me some advice/tips on how to get this done without pulling the whole motor apart.

  6. #6
    My name is Sean and I am addicted to STXs smokeysevin's Avatar
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    Pull the whole motor apart. You can leave the bottom end together but the rest has to be taken down.

    Sean

  7. #7
    Quote Originally Posted by furn1593 View Post
    Please give me some advice/tips on how to get this done without pulling the whole motor apart.
    You don't need to pull the whole motor apart.
    Lift out the motor, and then just remove the head and cylinder.
    Man up and just do it.


  8. #8
    I have no problem getting the head and cylinder out... but how/what are you compressing the rings with to get them back in the bore without taking the bottom end apart? and destroying the rings..

  9. #9
    Here is what it looked like the first time I was in there... for reference.
    Click image for larger version. 

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  10. #10
    Quote Originally Posted by furn1593 View Post
    I have no problem getting the head and cylinder out... but how/what are you compressing the rings with to get them back in the bore without taking the bottom end apart? and destroying the rings..
    I use the ring compressor special tools from Kawi. They are 2 pieces:
    1. P/N 57001-1095 (handle)
    2. P/N 57001-13201320 (strap for pistons diameter ranging 80 to 91 mm).

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