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P 11 ID numbers on motor

Discussion in 'Norton P11 Motorcycles' started by jeff Savage, Jan 8, 2020.

  1. jeff Savage

    jeff Savage

    Dec 18, 2019
    11/123001 are the numbers on the motor. Can anyone tell me the year made?
    Found my answer in another post. My 11/123001 if I am correct would be 11th from the last of the hi pipe models?
    Could anyone confirm or tell me if not.
    Last edited: Jan 8, 2020
  2. Junglebiker


    May 16, 2018
    That information is on the site if you search for it. I know that's not terrifically helpful, but honestly I can't remember where I found it when I went looking for it. I do remember that there is quite a bit of discussion on the subject and there seems to be some confusion out there regarding when exactly which numbers were made. Seems like a number of bikes that should theoretically be '68 models have '67 year model features. Or something like that.
  3. texasSlick

    texasSlick VIP MEMBER

    Jan 2, 2013
    Nortons were stamped with two digits to identify the Model, then with 6 digits to serialize the engine and frame.

    The number on the frame should match the engine number. On the frame, the Model number was stamped horizontally, and the 6 digits were vertical.

    I am not positively sure, but the number 11 indicates a P11.

    Somewhere there is a chart of codes and numbers grouped by year of mfg, but I am unable to find it. I am sure some one will chime in with that info.

  4. mdt-son


    Jan 19, 2012
    Hi Jeff,
    All P11 engines were stamped "P11 / 12xxxx" (starting at P11/121zzz and ending at P11/129zzz). Please note there were G15, Dominator (650/750) and early Commando models within this range.

    No, the "11" has nothing to do with the bike being a P11A featuring low-level headers.

    It seems you are missing a "P". Maybe it's been ground away, or your cases have been re-stamped. The font which was used for stamping at the factory is quite distinctive. You should look for other identity marks (or deviations of same) to confirm you have a genuine engine.

    Last edited: Jan 10, 2020

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