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1919 (?) motor

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  • #46
    Thanks for the photos. Regarding start numbers for BNs in their early years, I think they were the same as start numbers for SNs because BNs and SNs seem to have completely matched at that stage. Apparently BNs were introduced for 1909 when SNs ran consecutively and they continued to do so thru 1910 and into 1911 when they reached 10000. But while still in the 1911 production year a new number series was introduced, beginning around 100 according to Herb Wagner in The Antique Motorcycle in 2009. Along with the new start number the letter A was added at the end for the remainder of 1911 and I imagine the new format had already been used with BNs, given they were stamped before SNs.

    If that new start number is right it may explain photos I have of SN 5++A.
    Apparently a similar system was used for 1912 so it sounds like the start number was again around 100 although letters at the end were AB, BA or B.
    As of 1913 a new sequence of SNs would be issued for each model year but maybe that was only a reference to letters and perhaps the start number was again around 100? If so it may explain pictures of matching SN and BN 1++C as well as a photo of SN 7++D.
    Eric

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    • #47
      DSC_0036.JPGDSC_0035.JPGaknuck5.JPG I wonder if my 1915 #R50 numbers are replacement cases or if they are #1850.These pics are a friends NOS replacement 1941-1947 Knuck cases,made after Knuck production was over.[4sale].These have no VIN & only 2 digit belly #60.

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      • #48
        IMG_8204 (2).JPGIMG_8275 (2).JPG
        these are the Knuck's date codes inside the cases...dec '47 & Jan '48
        You do not have permission to view this gallery.
        This gallery has 1 photos.

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        • #49
          The oldest HD crankcase half that I have is this 1914 single drive side case that has identical engine and belly numbers.
          Corrosion has got at the belly number so it is a bit hard to decipher in a photograph but to the naked eye I'm sure it is 6003 DG DSCF4266.JPGDSCF4271.JPGDSCF4272.JPG
          Peter Thomson, a.k.a. Tommo
          A.M.C.A. # 2777
          Palmerston North, New Zealand.

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          • #50
            Originally posted by duffeycycles View Post
            I wonder if my 1915 #R50 numbers are replacement cases or if they are #1850.

            I thought R50 indicated 18050? And I wondered if they were leftover cases from 1914 that were used for your 1915 model. Could that work? (I don’t know much about differences in cases around that time.)
            Eric



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            • #51
              Eric..18050 on VIN 3193? I doubt it.
              My 1915 does not have 1914 cases.....
              The 1915-1916 are the same or very similar.1914 cases are narrower than later cases.
              Last edited by duffeycycles; 04-06-2022, 05:04 PM.

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              • #52
                It’s a mystery. If they’re not 1914 cases with a 1915 SN then maybe they are replacements as you suggested.
                Eric


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                • #53
                  I agree,another point on not 18,050 is,I think they made a few less than 17,000,1915s total production

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