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What are these numbers?
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Stoo63
GLASGOW
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March 26, 2020 - 8:04 pm
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GPO?s-l1600.jpg

'52 D1 direct lighting plunger; '58 Square Four (project); '55 D3 Battery; '59 D1 direct lighting plunger;  '59 Tiger Cub; '60 5TA;  '76 FS1-E '97 Honda Sky SGX50.

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sunny
Norfolk
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March 27, 2020 - 7:03 am
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oppps       ERS     ther   good  enginge    numbers       

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mikef
Chatham Kent
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March 27, 2020 - 7:32 am
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Hi Stoo.
      I think that I may have found the answer. ERS stands for engine replacement service.
See link below.
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Mike.

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cocorico
Central France
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March 27, 2020 - 7:56 am
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That is what sprang to mind with me, too.

1956 D3 running, lights to sort. 7 other bikes in the Barn. 1950 D1 engine now running.

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Stoo63
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March 27, 2020 - 9:08 am
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Excellent Mike. Thanks. Was just curious. Looked like someone had spilled their scrabble letters.... Another mystery solved through the power of the Forum 🙂

'52 D1 direct lighting plunger; '58 Square Four (project); '55 D3 Battery; '59 D1 direct lighting plunger;  '59 Tiger Cub; '60 5TA;  '76 FS1-E '97 Honda Sky SGX50.

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mikef
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March 27, 2020 - 9:34 am
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I wonder if it could also explain the mystery from the post link below.
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Mike.

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Stoo63
GLASGOW
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March 27, 2020 - 9:42 am
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Maybe, Mike. Although the stampings on that other casing look decidedly "homemade." Although, why would they have gone to the bother of adding those extra digits....

'52 D1 direct lighting plunger; '58 Square Four (project); '55 D3 Battery; '59 D1 direct lighting plunger;  '59 Tiger Cub; '60 5TA;  '76 FS1-E '97 Honda Sky SGX50.

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mikef
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March 27, 2020 - 9:57 am
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Yes got to agree with you there Stoo but then they look like the BSA punch form, who knows?
I made a mistake with the ERS letters. It stands for "exchange replacement service" and not "engine replacement service" as I originally posted.

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Neily
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March 27, 2020 - 5:49 pm
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I have weird numbers stamped in a scruffy fashion on the nearside case just above the mag.the font is or seems correct.I do not think I am going to restamp or change anything as it is part of history.I have a D14 but it has a D7 cylinder and B175 crank..which incidentally I am pleased.I am hoping to fit a D14 cylinder  shortly

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Stoo63
GLASGOW
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March 27, 2020 - 6:24 pm
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Yes, Neil. It's your numbers we're discussing above. Don't bear any resemblance to these ones though, alas.

'52 D1 direct lighting plunger; '58 Square Four (project); '55 D3 Battery; '59 D1 direct lighting plunger;  '59 Tiger Cub; '60 5TA;  '76 FS1-E '97 Honda Sky SGX50.

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JackE
Buxton, Derbyshire
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April 28, 2020 - 11:07 am
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mikef said
Hi Stoo.
      I think that I may have found the answer. ERS stands for engine replacement service.
See link below.
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Mike.  

Mike - that link you posted proved interesting.  On the left hand side, I noticed a tab marked 'BSA Service Sheets', so I clicked on it just out of curiosity, and it's a table showing a list of service sheet numbers down one side, with little crosses showing which models they apply to - covering all A, B, C, D and M ranges - and the service sheet numbers are links to the relevant pdf file for you to download.  Well worth bookmarking!

With best regards,

Jack

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Stoo63
GLASGOW
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April 28, 2020 - 11:20 am
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You can find most of the Bantam service sheets in the Members' Area, Jack, as well as a pile of other fascinating and useful ephemera 🙂

'52 D1 direct lighting plunger; '58 Square Four (project); '55 D3 Battery; '59 D1 direct lighting plunger;  '59 Tiger Cub; '60 5TA;  '76 FS1-E '97 Honda Sky SGX50.

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JackE
Buxton, Derbyshire
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April 28, 2020 - 12:18 pm
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Thanks for the heads up, Stoo - I have enjoyed browsing through them and learnt a lot, but the advantage of that Danish site is that it covers all other BSA ranges, too.

Best regards,
Jack

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