Compression Plates

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  • JStafford
    New Member
    • Dec 2025
    • 9

    #1

    Compression Plates

    What are the compression plates for an “F” model made of? Steel? Aluminum? If steel, were they parked? Cad? Plain?
  • Jerry Wieland
    Senior Member
    • Jan 2006
    • 2007

    #2
    The ones I had were steel and plain. I can only assume that they were OEM.

    Jerry

    Comment

    • Rubone
      Senior Member
      • Aug 2004
      • 4763

      #3
      I'm with Jerry, steel and plain.
      Robbie Knight Amca #2736

      Comment

      • joe fxs fxr
        Senior Member
        • Dec 2020
        • 681

        #4
        My curiosity is piqued, what are compression plates? Thanks?
        AMCA #41287
        1971 Sprint SS350 project
        1972 FX Boattail Night Train
        1972 Sportster project
        1973 HD Golf Cart project
        1979 FXS 1200 never done playing
        1989 Springer Softail project
        1998 Dyna Convertible - 100% Original
        96" Evo Softail self built chopper
        2020 Heritage Classic 114
        plus 15 other bikes over the years...

        Comment

        • Rubone
          Senior Member
          • Aug 2004
          • 4763

          #5
          Originally posted by joe fxs fxr View Post
          My curiosity is piqued, what are compression plates? Thanks?
          Plates of predetermined thickness added under cylinders to lower compression. Often used on commercial or sidecar equipped MC engines.
          Robbie Knight Amca #2736

          Comment

          • JStafford
            New Member
            • Dec 2025
            • 9

            #6
            Thanks for the responses guys. I kinda figured they weren’t aluminum.

            Comment

            • joe fxs fxr
              Senior Member
              • Dec 2020
              • 681

              #7
              Originally posted by Rubone View Post

              Plates of predetermined thickness added under cylinders to lower compression. Often used on commercial or sidecar equipped MC engines.
              Thanks! I'm always learning something here.
              AMCA #41287
              1971 Sprint SS350 project
              1972 FX Boattail Night Train
              1972 Sportster project
              1973 HD Golf Cart project
              1979 FXS 1200 never done playing
              1989 Springer Softail project
              1998 Dyna Convertible - 100% Original
              96" Evo Softail self built chopper
              2020 Heritage Classic 114
              plus 15 other bikes over the years...

              Comment

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