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  1. #1
    Carson's Avatar
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    Cannot believe I just did that...

    While trying to pull my PTO coupler out.. I broke a piston.
    Click image for larger version. 

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    More than pissed. Anyone have one for sale? Was getting ready to close this project up, I was purchasing the gaskets when this happened. UGH. Well this is gonna change my finish date.. BlueFishCrisis is selling me my gaskets. Anyone else have a 750 piston for sale?


  2. #2
    Click avatar for tech links/info, donation request K447's Avatar
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    How exactly did you manage to do the damage?

  3. #3
    Carson's Avatar
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    I had the cylinder pulled on that piston, and it got caught on the base. I'm not quite sure how the rope slipped from the front two cylinders preventing the pistons from moving. Looking for a replacement piston as we speak...


    Rope's cut in half My signature always gets me.

  4. #4
    Click avatar for tech links/info, donation request K447's Avatar
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    Quote Originally Posted by Carson View Post
    I had the cylinder pulled on that piston, and it got caught on the base. I'm not quite sure how the rope slipped from the front two cylinders preventing the pistons from moving. Looking for a replacement piston as we speak...


    Rope's cut in half My signature always gets me.
    So you were removing the PTO drive shaft coupler, and you had inserted rope into the front and center cylinders to hold the crank shaft from turning, correct?

    When using the 'rope trick' to hold the piston, it is important to turn the crank shaft until the piston has started compression. I put my thumb over the spark plug hole and turn the crank shaft counter clockwise until I can feel the compression begin. Then I feed in as much clean rope as will fit into the combustion chamber.

    This method prevents the rope from getting into the ports on the cylinder walls. If the rope gets into the ports then the edge of the piston will trap the rope between the top edge of the piston and the top of the port opening, acting like a shear cutter on the rope.

    It is also recommended to put the rope into the cylinder closest to the end of the engine you are working on, so the best place for the rope is the PTO cylinder when removing the PTO coupler.

  5. #5
    Carson's Avatar
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    Quote Originally Posted by K447 View Post
    Quote Originally Posted by Carson View Post
    I had the cylinder pulled on that piston, and it got caught on the base. I'm not quite sure how the rope slipped from the front two cylinders preventing the pistons from moving. Looking for a replacement piston as we speak...


    Rope's cut in half My signature always gets me.
    So you were removing the PTO drive shaft coupler, and you had inserted rope into the front and center cylinders to hold the crank shaft from turning, correct?

    When using the 'rope trick' to hold the piston, it is important to turn the crank shaft until the piston has started compression. I put my thumb over the spark plug hole and turn the crank shaft counter clockwise until I can feel the compression begin. Then I feed in as much clean rope as will fit into the combustion chamber.

    This method prevents the rope from getting into the ports on the cylinder walls. If the rope gets into the ports then the edge of the piston will trap the rope between the top edge of the piston and the top of the port opening, acting like a shear cutter on the rope.

    It is also recommended to put the rope into the cylinder closest to the end of the engine you are working on, so the best place for the rope is the PTO cylinder when removing the PTO coupler.
    I should have done that. I'm still shocked at the fact I just did that! Thanks for the info, I'll be sure to remember that. You wouldn't happen to have a piston for sell? Or know someone that does?

  6. #6
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    A new WSM piston is about 75 bucks.......

  7. #7
    Carson's Avatar
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    Quote Originally Posted by BryanP View Post
    A new WSM piston is about 75 bucks.......
    Exactly. I need a used one for about $40.

  8. #8
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    Quote Originally Posted by Carson View Post
    Quote Originally Posted by BryanP View Post
    A new WSM piston is about 75 bucks.......
    Exactly. I need a used one for about $40.
    Its 35 dollars, and it includes new rings. You cant just willy nilly go throwing different pistons in a motor and expect it to be reliable. The correct way to do it is to lightly hone the cylinder, and install new rings. If you are shelling out for new rings, you might as well spend a few bucks more and get a whole piston kit that includes the rings.

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  10. #9
    I'm addicted to Polaris PWC ghostinstallations's Avatar
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