Author Topic: A7 Motor with odd Suffix  (Read 2498 times)

Online Black Sheep

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Re: A7 Motor with odd Suffix
« Reply #15 on: 20.04. 2017 22:26 »
I can confirm that BSA returned race bike spec stuff to the service dept. Some years ago I picked up a standard bore service exchange set of thick flange small fin barrels and pistons, normally only seen on Daytona machines.
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Offline Joolstacho

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Re: A7 Motor with odd Suffix
« Reply #16 on: 21.04. 2017 00:19 »
My late type pre-unit crankcases have no number at all. I was told by the feller who sold me the engine that when BSA supplied replacement crankcases BSA left them unstamped because they wouldn't know whether it would be used for an A10 or A7. Can anyone from back in the day confirm?
(Apparently it had been in a grass-track outfit which had previously had a blow-up).

Online JulianS

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Re: A7 Motor with odd Suffix
« Reply #17 on: 21.04. 2017 09:06 »
See below BSA parts bulletin from 1954, last paragraph - yes they came without numbers stamped.

Sorry its a poor copy.

Offline Joolstacho

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Re: A7 Motor with odd Suffix
« Reply #18 on: 21.04. 2017 09:41 »
Well, mine must have escaped this bulletin (who'd be surprised? -It was probably friday arvo, - race to get down to the pub for a pint or six!)
(Note " should" not 'must')  ;)

Oh, and I bet more than a few disappeared out the factory gates in lunch bags too.

Offline trevinoz

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Re: A7 Motor with odd Suffix
« Reply #19 on: 22.04. 2017 00:14 »
This will give the purists something to think about.
There has been much discussion whether fonts on characters are correct from the factory or fraudulent.

Online Klaus

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Re: A7 Motor with odd Suffix
« Reply #20 on: 04.05. 2017 22:40 »
I have found an enginecase stamped DR 150069 CAL  this is not an Ariel Number.
Does anybody know more about this Number.
May be Daytona, its only a suggest.

cheers Klaus


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