Piston 1st oversize 80-82

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  • JCW
    XSive
    • Jan 2014
    • 11
    • Chicago, Il

    #1

    Piston 1st oversize 80-82

    Looking for an 80-82 xs11/xj11 1st oversize +0.25mm oem piston and ring set.

    Thanks

    Tried ebay and some of the vintage parts places without luck.
    Last edited by JCW; 02-02-2014, 01:06 AM.
    XS850
  • D0wn5h1ft
    XSive Maximus
    • Aug 2013
    • 515
    • Westerly, RI.

    #2
    Just the piston:




    Piston with Ring:
    78 E - 2to1 exhaust, dynatek coils, special headlight [SOLD!]
    79 F - gas tank refurb, headgasket change, straight pipes, late model carbs, virago lowering shocks, special headlight and gauges, TC fuse block, GSXR-1100 carbs (WIP)


    "May my tires not fail me, nor my engine grow cold"

    Comment

    • JCW
      XSive
      • Jan 2014
      • 11
      • Chicago, Il

      #3
      thanks for looking but I really wanted the higher domed pistons from 80-82.

      but beggars cant be choosers...
      XS850

      Comment

      • D0wn5h1ft
        XSive Maximus
        • Aug 2013
        • 515
        • Westerly, RI.

        #4
        Originally posted by JCW
        thanks for looking but I really wanted the higher domed pistons from 80-82.

        but beggars cant be choosers...
        You should specify which bike you're buying for in the future. It helps people track stuff down for you. Also, I'd make sure you're replacing it with pistons that match the ones you already have in. A mismatch and I can't even imagine what would happen, best case scenario stumbling that can't be fixed. Worst case scenario, bent crank.
        78 E - 2to1 exhaust, dynatek coils, special headlight [SOLD!]
        79 F - gas tank refurb, headgasket change, straight pipes, late model carbs, virago lowering shocks, special headlight and gauges, TC fuse block, GSXR-1100 carbs (WIP)


        "May my tires not fail me, nor my engine grow cold"

        Comment

        • JCW
          XSive
          • Jan 2014
          • 11
          • Chicago, Il

          #5
          Originally posted by D0wn5h1ft
          You should specify which bike you're buying for in the future. It helps people track stuff down for you. Also, I'd make sure you're replacing it with pistons that match the ones you already have in. A mismatch and I can't even imagine what would happen, best case scenario stumbling that can't be fixed. Worst case scenario, bent crank.
          I thought I was being pretty specific in my first post.
          And I have two just need one more.
          You're reading way more into this than you need to...
          XS850

          Comment

          • D0wn5h1ft
            XSive Maximus
            • Aug 2013
            • 515
            • Westerly, RI.

            #6
            Originally posted by JCW
            I thought I was being pretty specific in my first post.
            And I have two just need one more.
            You're reading way more into this than you need to...
            Missed that 80-82 part. That's my bad. What are you trying to do with your engine? Full bore and hone or replacing pistons and rings to try and gain compression?
            78 E - 2to1 exhaust, dynatek coils, special headlight [SOLD!]
            79 F - gas tank refurb, headgasket change, straight pipes, late model carbs, virago lowering shocks, special headlight and gauges, TC fuse block, GSXR-1100 carbs (WIP)


            "May my tires not fail me, nor my engine grow cold"

            Comment

            • JCW
              XSive
              • Jan 2014
              • 11
              • Chicago, Il

              #7
              short story- the second one. more compression on an early head.

              long story- i feel the early head is choked at the current displacement above 8000rpm. going with larger pistons will just make this worse.

              plan on opening intake throat to 90% valve diameter (shooting for 31mm+ at the throat), cams with increased lift and good valve job.

              i calculate a mach index of 0.57 bone stock at 8000 rpm.

              The mach index for maximum volumetric efficiency is .5
              When Mach Index = .55 to .60 the combination is CHOKED at that RPM.


              with the mid level megacycle cam i gain lift to .380 and drop the mach index to 0.52
              may even spec out a slightly higher lift of .390 for a mach index closer to 0.5.

              Plan on just using another stock intake cam on the exhaust side to save some $$$.
              XS850

              Comment

              • JCW
                XSive
                • Jan 2014
                • 11
                • Chicago, Il

                #8
                found one

                Thanks for looking
                XS850

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