Fitting Pistons/ Rings Into Barrels 900 Superlight Help Please

Discussion in 'Supersport (1974-2007)' started by KG900SL, Apr 12, 2015.

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  1. Tried fitting Pistons and barrels yesterday, managed to break the 1 oil ring.

    DAM [​IMG]

    How do you go about doing this installation, the Haynes manual is rather vague.

    Thank you
    Regards
    K[​IMG]
     
    #1 KG900SL, Apr 12, 2015
  2. I use a home-made ring compressor which is basically a narrow strip of shim steel (steel packaging banding works) and a large jubilee clip.

    Piston on conrod and fit the compressor onto the piston, over the rings (plenty of oil) then loosen enough so that it can slide down. Then using my hand tap/push the cylinder onto the piston, making sure it goes down square, the edge of the cylinder will push the compressor down off the rings as the rings slide in to the cylinder. Remove the clip before seating the cylinder onto the block with threebond, works everytime.

    Here's a pic of my home made ring compressor;

    [​IMG]

    You can buy ready made versions but most that I have seen are too bulky.
     
    #2 Dukedesmo, Apr 12, 2015
    • Like Like x 1
  3. Thanks all for the info and tips!!!

    Was hopping mad yesterday afternoon after my broken ring episode, I decided to have a few wiskeys... I suffered the consequences today:eek:

    Will have to source a new set of OEM rings, Ill do both pistons and see if I cant find a decent ring compressor tool.
    All they have locally are these big bulky 80mm high, 55-125mm multi tool, cheap and nasty, maybe I can modify It???

    I will have to rethink the installation procedure, I got the piston and rings into the barrel, left it sticking out just enough to get the gudgen pin through, as I was inserting the gudgeon pin, the piston dropped by 1mm, lower oil seal popped out and went SNAP:mad:

    Ill have to fit pistons onto con rod, them drop barrel onto the piston and rings VERY CAREFULLY, hopefully better luck this time.

    First have to shell out some more loot for the bloody rings now:mad:
     
    #3 KG900SL, Apr 12, 2015
    Last edited: Apr 12, 2015
  4. I always fit the piston [and rings] into the barrel first on the bench, then carefully lower as a unit onto the con rod.I've not broken a ring since,remember used rings will become brittle with use and age.Was it the front cylinders ring that you broke?
     
    #4 AC2VDT, Apr 12, 2015
    • Dislike Dislike x 1
  5. I tried It your way, but the piston dropped slightly scew, so tried to push the ring in gently, and SNAP. It was the vertical cylinder. Yup, very brittle!!!
     
    #5 KG900SL, Apr 12, 2015
  6. KG, nip down to your local yam dealer, they have piston ring tool which is like a set of spring loaded pliers with a nice lead for the cylinder :)
     
    #6 Sev, Apr 13, 2015
  7. Wide cable ties, then snip them off the rod when you push the piston home ;-)
     
    #7 nuttynick, Apr 13, 2015
    • Like Like x 2
  8. I use a broken flat tape measure 18mm wide and a cable tie.......it was 30m long originally until some tit in a dumper drove over it.
     
    #8 Ghost Rider, Apr 13, 2015
    • Like Like x 1
  9. I fortunately managed to source a OIL RING, cost me a frikken fortune...

    Both pistons placed in heads courtesy my local Ducati shop, will attempt refit tomorrow...

    OHH BOY... Dreading the install[​IMG]
     
    #9 KG900SL, Apr 13, 2015
  10. how much does a ducati piston ring kit cost for one piston?
     
    #10 Sev, Apr 13, 2015
  11. I found it cheaper and easier in the end to get some JE hi-comp pistons than sourcing piston rings.

    Yorkie
     
    #11 Yorkie, Apr 14, 2015
    • Like Like x 1
  12. I oil ring only,Local currency R450.00 = $38.00
    Set of new Rings R2400.00

    Total Ripoff!!!
     
    #12 KG900SL, Apr 14, 2015
    • Agree Agree x 1
  13. I bought a genuine Ducati ring set a few years back, IIRC it cost me around £200.
     
    #13 Dukedesmo, Apr 14, 2015
  14. fuck my old boots!!

    and I thought I was hard done by for 40 quid for a yam piston ring kit :eek:
     
    #14 Sev, Apr 14, 2015
  15. See?

    Sometimes it pays to leave the damn thing alone.
     
    #15 Ghost Rider, Apr 14, 2015
    • Like Like x 1
  16. I did the same as Yorkie, fitted JE high comp pistons : )
     
    #16 Gillan 900, Apr 14, 2015
  17. I too was going to shell out some more loot for the JE High comp piston set, however fortunately managed to source a single oil ring. My pistons/ rings and barrels are still in pristine condition:)
    I can throw the cash at some FCR's + Ignitech SPARKER TCIP4 + coils and leads + some BEER:upyeah:+ and some more BEER after I receive my credit card bill:eek:
     
    #17 KG900SL, Apr 14, 2015
    • Like Like x 2
  18. Pistons & rings fitted into barrels this time no fuss with a ring compression tool.

    2nd pair of hands helped to position barrels onto studs, guided in just enough to fit gudgeon pin, and then fit those 2 bastard circlips.

    Heads torqued 20/ 30 Nm.

    No SNAP of the studs...:)

    Thanks for all tips and advice!

    Regards
    K:upyeah:

    IMG_0413.JPG

    IMG_0414.JPG
     
    #18 KG900SL, Apr 19, 2015
    • Like Like x 2
  19. looking nice :upyeah:
     
    #19 johnboy, Apr 19, 2015
  20. Thanks for the compliment johnboy:upyeah:
     
    #20 KG900SL, Apr 19, 2015
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