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  1. #1
    kmaher's Avatar
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    Easy piston insertion? (GP1300r)

    Almost done with my rebuild and I'm at the pleasant point where I'm trying to fit the cylinders back over the pistons (otherwise known as living hell)

    As I've sat here struggling with the first one for over half an hour, I realize that someone has probably devised an easy method to do this.

    I almost wish I had inserted the piston into the cylinder before attaching it to the rod, but I'm sure that's a nightmare as well.

    Alright, folks....enlighten me. You can make fun of me for my stupidity, too. I'm literally here compressing rings with my fingers and praying it slides on eventually. I know it eventually will from prior experience, but I don't want to lose my remaining sanity.


  2. #2
    yamahasrule's Avatar
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    I have had to do this multiple times over the years. For me, the easiest method was to start with the front cylinder. Line up the rings on the pins first. Then gently lower the cylinder onto the top of the piston, holding the cylinder on each side with your fingers just low enough to guide the piston in, and press the rings in while slowly lowering the piston on. Then move to the next one. Once you get the feel for it, it goes really easy. In the past I used a very large , wide zip tie to compress the ring and hold it while I slid the cylinder down. Then just cut it with some dikes and remove it before you slide the cylinder all the way down. That worked with mixed results. Sometimes it would slide off before the rings started in the cylinder.

  3. #3
    kmaher's Avatar
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    Yeah, this is the method I'm utilizing. The problem I keep encountering is that once the tapered sides of the cylinders go over the top ring, it seems like they're compressing the ring in an oblong fashion.

    I think I'm going to try zip ties, but I'm pretty sure it's going to result in the same situation since those tapered sides will push the ring out oblong as it pushes the zip tie down.

    Appreciate the input - at least I know I'm doing the right way, albeit unsuccessfully.

  4. #4
    kmaher's Avatar
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    Alright....I'm an idiot....I must not have properly checked the ring gap...it's off substantially

  5. #5
    kmaher's Avatar
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    Scratch that....ring gap is fine.

    This is my first time using Pro-X pistons, and I notice a major design difference from OEM. OEM's rings have an indentation for the locating pin, but Pro-X doesn't. It's a tapered ring, but since the locating pin is centered, it's still bulging when compressed. If I file the ring more, I'll end up with a more significant gap than I would like, so now I'm tempted to buy some stock rings to use with these pistons.

    I know a lot of other folks have experience with Pro-X. What am I doing wrong here? Yes, I have "top" facing up on the ring

  6. #6
    jeffg426690's Avatar
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    Maybe a silly thought, but are you sure you have the correct size pistons? ProX comes in several sizes, correct size depending on your jug bore

  7. #7
    steve45's Avatar
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    I use hose clamps. Tighten them to make sure the rings are aligned in the grooves, then loosen them a little so the pistons will slide through them.

  8. #8
    kmaher's Avatar
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    I'm pretty sure they sent me the wrong rings - could someone confirm?

    I was expecting notched rings like OEM so it could fit around the locating pin. They sent me tapered ring (pictured). I can't imagine a scenario where this ring type would work without having excessive ring gap.

    Could someone with Pro-X confirm if they received tapered or notched rings?

    Here's Pro-X:

    Click image for larger version. 

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    And here's stock:

    Click image for larger version. 

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  9. #9
    jeffg426690's Avatar
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    You have the correct rings, be sure to measure the gap before installing themClick image for larger version. 

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  10. #10
    kmaher's Avatar
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    Quote Originally Posted by jeffg426690 View Post
    You have the correct rings, be sure to measure the gap before installing themClick image for larger version. 

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ID:	445088Click image for larger version. 

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    Really? How are tapered rings supposed to successfully work with a centered locating pin?

    Ring gap is correct when measured at the bottom of the cylinder, but tapered rings will not seal around the pin.

    You're 100% sure they aren't supposed to be notched rings?

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