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The BSA A7-A10 Forum
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A7 & A10 Engine
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A10 crankshaft stamped numbers and letters
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Topic: A10 crankshaft stamped numbers and letters (Read 825 times)
PaulieK
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Join Date: Oct 2024
Posts: 19
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A10 crankshaft stamped numbers and letters
«
on:
23.12. 2025 15:17 »
Hi guys
Could you look at the attached pictures and tell me what the various numbers and letters mean on the crankshaft of my spitfire scrambler.
Regards
Paul
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muskrat
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Wise & Enlightened
Join Date: Jul 2009
Posts: 11457
Karma: 137
Lithgow NSW Oz
Re: A10 crankshaft stamped numbers and letters
«
Reply #1 on:
23.12. 2025 19:53 »
G'day Paul.
I can't help with the meaning of those but you will find a few ambiguous stampings in and around the motor/gearbox. Has a lot of people scratching their heads.
Cheers
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'51 A7 plunger, '57 A7SS racer now a A10CR, '83 CB1100F, 88 HD FXST, 2000 CBR929RR ex Honda Australia Superbike .
Australia
Muskys Plunger A7
PaulieK
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Join Date: Oct 2024
Posts: 19
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Re: A10 crankshaft stamped numbers and letters
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Reply #2 on:
23.12. 2025 20:49 »
Thanks Muskrat
Just wondering what they all mean, bit like a dog with a bone, hopefully will get some more info on them.
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Black Sheep
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Join Date: Apr 2017
Posts: 1290
Karma: 10
Re: A10 crankshaft stamped numbers and letters
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Reply #3 on:
24.12. 2025 06:51 »
They mean that someone has a set of stamps (or teeps in Scotland).
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2 twins, 2 singles, lots of sheep
Swarfcut
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Join Date: Oct 2018
Posts: 2701
Karma: 58
Re: A10 crankshaft stamped numbers and letters
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Reply #4 on:
24.12. 2025 08:47 »
One possible is that they are simply part of the the production process to identify source of supply, quality inspection, batch code etc.
Swarfy.
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PaulieK
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Join Date: Oct 2024
Posts: 19
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Re: A10 crankshaft stamped numbers and letters
«
Reply #5 on:
24.12. 2025 09:28 »
Hi Swarfy
You are probably right, it does seem like that, I just wondered had they anything to do with the crank weight or balancing of during its assembly.
Thanks guys
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The BSA A7-A10 Forum
»
Technical (Descriptive Topic Titles - Stay on Topic)
»
A7 & A10 Engine
»
A10 crankshaft stamped numbers and letters