70mm GSXR Pistons in 16V GS750 motor?

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  • Matt420740
    • Dec 2025

    #1

    70mm GSXR Pistons in 16V GS750 motor?

    Been looking at the Wiseco 816 big bore kit for my 1982 16V 750. The 816 kit has 70mm pistons, compared to the stock 67mm. I notice the early GSXR750 also has 70mm pistons, and I can get a set from a 1990 model cheap. Does anyone know if they will work in the GS motor with the proper bore?
  • GregT
    Forum Sage
    • Jul 2009
    • 3541
    • New Zealand

    #2
    Without looking it up, I'm pretty sure the GSXR pistons have bigger gudgeon pins - or piston pins as you Americans call them.
    Again from memory, the GSXR pistons have a lower deck height.
    So, yes, possible if like me you're at the end of the world and can't get anything else. But difficult.

    Last time I bought the Wiseco pistons for the 16V 750, I thought they were quite reasonably priced - off ebay.

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    • storm 64
      Forum Sage
      Past Site Supporter
      Super Site Supporter
      • May 2012
      • 4569
      • Youngstown,Ohio

      #3
      Wrist Pins is what we sometimes call them. But I like Grudgeon Pins, I'll have to try to remember that. 👍
      My Motorcycles:
      22 Kawasaki Z900 RS (Candy Tone Blue)
      22 BMW K1600GT (Probably been to a town near you)
      82 1100e Drag Bike (needs race engine)
      81 1100e Street Bike (with race engine)
      79 1000e (all original)
      82 850g (all original)
      80 KZ 650F (needs restored)

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      • Matt420740

        #4
        Thanks for the replies. I found a 1100 motor cheap and threw that in instead. 102721429_1615754045257652_1517864002502004787_o.jpg

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        • Grimly
          Forum Guru
          Past Site Supporter
          Super Site Supporter
          • Sep 2012
          • 5733
          • Ireland

          #5
          Originally posted by Matt420740
          Thanks for the replies. I found a 1100 motor cheap and threw that in instead. [ATTACH=CONFIG]61174[/ATTACH]
          That'll help you keep up with the traffic.
          Dave
          '79 GS850GN '80 GS850GT
          Only a dog knows why a motorcyclist sticks his head out of a car window

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