Author Topic: Engine and frame numbers  (Read 575 times)

Offline Voldsgaard

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Engine and frame numbers
« on: 08.10. 2020 17:11 »
Hello *smiley4*

I bought a A10 GF this summer, but I'm getting confused with the frame and engine numbers, and I am not sure that I have understand it correctly.

Engine: CA108172.
Frame: GA7A2639.

From what I have read, is that my engine should be around 1956-57.
And my frame would from 1962-63.

Am I correctly?

The first registration of the bike is from 1960.
Is it possible that the previous owner have chanced the frame and engine, because the first registration is from 1960?

I hope you guys can help me  *smiley4*

Thanks in advance.

Niels
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Online JulianS

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Re: Engine and frame numbers
« Reply #1 on: 08.10. 2020 17:25 »
Are you sure of that frame number?

GA7A prefix was used on the A10 Spitfire Scrambler between September 1959 and September 1962. The highest number was in the 7 hundreds.
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Offline Swarfcut

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Re: Engine and frame numbers
« Reply #2 on: 09.10. 2020 08:57 »
 If the numbers are correct the engine is certainly earlier than the frame. A later frame has an sheet metal strengthening wraparound running almost the full height of the steering head. On earlier frames (contemporary with the engine number) this only goes a third of the way up.

 Swarfy.
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Online JulianS

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Re: Engine and frame numbers
« Reply #3 on: 09.10. 2020 09:27 »
The wide steering head brace was introduced from around August 1960 for the 1961 season models.
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Offline Voldsgaard

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Re: Engine and frame numbers
« Reply #4 on: 09.10. 2020 11:31 »
I will take some photos of the engine and frame number later today. And a few of the steering head.

I think it will help you guys.

I really appreciate the help.


Niels.
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Offline Voldsgaard

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Re: Engine and frame numbers
« Reply #5 on: 09.10. 2020 15:58 »
I have taking the photos of the frame number and steering head, and a photo of the engine number.

On the frame number, I think it is a "G" but if it is a "C" it is my reading-mistake  *smiley4*

I hope it will help.


Niels.
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Online Klaus

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Re: Engine and frame numbers
« Reply #6 on: 09.10. 2020 16:37 »
Hi Niels,

It is an A10 Frame from 1960
The Engine ist one of the last in 1958
Engine Number CA10 R 8193 is the first in 1959

cheers Klaus
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Online Klaus

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Re: Engine and frame numbers
« Reply #7 on: 09.10. 2020 16:45 »
Ups, Framenumbers with GA7A are for Spitfire but they have only 3 Numbers.
Hm There must be something wrong, as shown in an other reply.
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Offline RDfella

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Re: Engine and frame numbers
« Reply #8 on: 09.10. 2020 17:24 »
Have to say with the shape, form and spacing of the numbers (especially frame) it doesn't look like they've been messed with so must be original.
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Online JulianS

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Re: Engine and frame numbers
« Reply #9 on: 09.10. 2020 17:51 »
The engine is early 1956 season.

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Online RichardL

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Re: Engine and frame numbers
« Reply #10 on: 09.10. 2020 18:21 »
3.242 "CA10" engines after my '55.

Richard L.
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Online KiwiGF

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Re: Engine and frame numbers
« Reply #11 on: 09.10. 2020 21:16 »
The uk bsa club site has comprehensive info on frame numbers and shows GA7A numbers up to 1963.

I’m no expert but the frame number looks correct to me, only very slight doubt would be the number 2, which sometimes have a sharper corner on the bottom than 90deg (if that makes sense).



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Online JulianS

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Re: Engine and frame numbers
« Reply #12 on: 09.10. 2020 22:52 »
Look at the slight curve on the legs of the A and compare with the A on your own frames and see what you think.
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Online Klaus

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Re: Engine and frame numbers
« Reply #13 on: 10.10. 2020 02:06 »
I ask me why the forth, Number 9 is not in line with the others?

Klaus
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Offline Voldsgaard

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Re: Engine and frame numbers
« Reply #14 on: 11.10. 2020 08:04 »
Good question, it's very hard to say what the previous owner did to the frame number, because you are right, number 9 is not in line with the others.

But I really learned a lot about my frame and engine, I really appreciate the help.

Thank you very much.


Niels.
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