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Thread: Difference between a 1922 Model J and JD

  1. #1

    Difference between a 1922 Model J and JD

    HI gang,
    Can someone please explain the difference between a Model J and JD?

    Thanks
    Tom
    Last edited by Tom McBride; 02-05-2010 at 10:13 PM.

  2. #2

  3. #3
    Join Date
    Nov 2008
    Location
    new britain pa
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    1,983

    Re: Difference between a 1922 Model J and JD

    tom a j is 61 ci a jd is 74 ci. easy way to tell is look at the cylinders.on a j exaust spigot you will see 5 fins that is a 61 ci. on a jd exaust spigot there is 6 fins. that is a 74 ci cylinder

  4. #4

    Re: Difference between a 1922 Model J and JD

    Rob is right on the money with his response. Both are fun bikes but the JD has more power. Sort of like comparing an EL and an FL Knucklehead or Panhead.
    Buzz Kanter
    American Iron Magazine Forum Harley forum
    American Iron Magazine Harley magazine
    Classic Harley Classic Harley Info
    American Iron Magazine Digital Delivery

    "It is always fascinating to watch the development of rationalizations for an argument"


  5. #5

    Re: Difference between a 1922 Model J and JD

    Tom,

    According to my spare parts book, different part numbers for the cases, flywheels, connecting rods, cylinders, pistons, etc.
    Dave Morrill
    Sylacauga, AL. USA.

    Deadly Dave's Blog
    Lost Stories of Early American Motorcycling.

    http://dlmracing.blogspot.com/

    1921 Harley-Davidson Model J Racer

    It will break a hundred, if dropped from an airplane!

  6. #6

    Re: Difference between a 1922 Model J and JD

    PERFECT!~
    Thank you ALL who have replied!
    This helps alot!

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