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XJ 900 N PISTONS AND RING MODIFICATIONS

Discussion in 'XJ Modifications' started by DavidXJ900N, Oct 5, 2012.

  1. DavidXJ900N

    DavidXJ900N New Member

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    Hello Chaps,

    Well after a 2 weeks of searching and finding the XJ 900 price for rings is now $105 RRP per piston, I have tried Germany, Japan direct everyware . I was thinking that is just a bit steep considering I can buy new piston and rings for that price.

    I have done lots of testing and numerous measurements and with my compression just a tad low and the bores needing honing I think I will go the new piston modification option. I might bore it out and throw in a set of XS 400 1979 pistons. They are 69.25mm 1st oversize - mine are 68.5mm. Question - not sure if the piston rod is the same. Does anyone have any ideas or thrown any other pistons in their XJ 900. I am a DIY guy if you have any suggestion please reply. I would prefer new pistons and rings based on testing.....
     
  2. MacMcMacmac

    MacMcMacmac Member

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    Probably easier to get an aftermarket piston ring catalog and cross reference to something else. You can fit certain Acura piston rings in an XS650 with no mods.
     
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  3. adrian1

    adrian1 Active Member

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  4. kinen1

    kinen1 Member

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    thanks Adrian! I am looking at boring out one of my 750! :)

    kinen1
     
  5. MiGhost

    MiGhost Well-Known Member

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  6. Malcolm Doswell

    Malcolm Doswell New Member

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    Hey david did you ever find a set of piston that work in the xj? I have an 891cc version and cant get pistons or rings for it anywhere it seems. regards mal
     
  7. MattiThundrrr

    MattiThundrrr Not a guru

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    David hasn't been around here for 6 years.
     
  8. XJ550H

    XJ550H Well-Known Member Premium Member

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    ask @chacal aka Len at www.xj4ever.com he lists ring sets for the 900
     
  9. chacal

    chacal Moderator Moderator Supporting Vendor Premium Member

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    Unfortunately we only have them for the 853cc version of the "900" engines................the later "true" (891cc) engines use different pistons and rings which we cannot currently supply.
     
  10. Malcolm Doswell

    Malcolm Doswell New Member

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    Does anyone know it the later model pistons are the same deck height as the earlier ones. Specifically would the xj 900 1996 pistons fit an xj 900 1985? both bikes run the same bore and stoke dimensions
     
  11. Malcolm Doswell

    Malcolm Doswell New Member

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    I can get a set of forged piston kits made in australia at a cost of $1500
     
  12. Malcolm Doswell

    Malcolm Doswell New Member

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    I am investigating the possibility of using pistons out of a 1996 model in a 1985 model. I will keep you informed of the progress. Did you ever put those xs 400 pistons in?
     

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