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  1. #1

    Installing 750 Piston Rings

    I bought a WSM piston kit for an SL750 and I want to know how the rings are installed.

    There is a slip of paper that came with the kit that says "When installing WSM rings if there is a polished edge, it is installed in top ring groove". There doesn't seem to be a polished edge on either of the rings. On one side of the rings there is lettering of "RN". Which side goes up and which side goes down? Is there a difference between the two rings or are they both the same?

    Final question, after the rings are put on the piston, which direction do the "openings" in the rings face?

    Thanks for your help.


  2. #2
    Lake Mead Bum & BTLS Mark starflight's Avatar
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    The rings are the same. They are beveled on one side, and the bevel goes up. If you look in the grooves of the piston you will see a pin. The pin is to be positioned in the ring gap to keep the ring from spinning. The arrow on the piston points towards the mag.

    If you should install the rings upside down, the rings will stick inside the grooves. They should be able to move freely in the groove when compressed and released.
    Last edited by starflight; 06-13-2008 at 07:38 AM.

  3. #3
    Thanks, got it. Makes perfect sense! Remind me though, which is mag, front or back?

  4. #4
    Lake Mead Bum & BTLS Mark starflight's Avatar
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    Front- forward.

  5. #5
    bnasty's Avatar
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    The 'RN' etching will be facing up when properly installed for WSM kit on the 750 motor. I just did this the wrong way, and had to go back and fix it...

  6. #6
    Feral's Avatar
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    Quote Originally Posted by bnasty View Post
    The 'RN' etching will be facing up when properly installed for WSM kit on the 750 motor. I just did this the wrong way, and had to go back and fix it...
    Uhh thats not good Hopefully you caught that before you snagged a ring on a port or got it before it serously did damage

  7. #7
    bnasty's Avatar
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    Most definitely, I thought something was wierd, I had just started installing the rings, and realized that they werent lining up very neatly...Anyway, I now know for next time! (This was my first top end job as well!!)

  8. #8
    bnasty's Avatar
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    kepneriphone -

    Be sure also when you are installing the circlips, that the open ends are facing up.

  9. #9
    Feral's Avatar
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    Quote Originally Posted by bnasty View Post
    Most definitely, I thought something was wierd, I had just started installing the rings, and realized that they werent lining up very neatly...Anyway, I now know for next time! (This was my first top end job as well!!)

    Heheh the end result after a Snagged ring ( This is nasty )

    P.S. and yeah thats the shattered ring peices imbedded THROUGH the piston
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  10. #10
    bnasty's Avatar
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    Looks like a little modern art-deco piece!!

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