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A10 numbers
#817180 07/23/20 5:06 pm
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CA10R 19947 HHC Reggy says 1961 but not coming up that way.
GA7 19947 Frame

Last edited by Cheyenne; 07/24/20 1:44 am.
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Re: A10 numbers
Cheyenne #817187 07/23/20 5:54 pm
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Frame and motor number would not match pre 64 unless very early in a years build by accident, prefixs did not match, CA10R is 1959 engine and should have a frame prefix starting FA7. This suggests that the frame has been restamped to match the engine. Also 19947 is a very high number, 1958 started at 6001, 1959 started at 8193. Maybe its CA10R 9947 with a 1 added to the front, the frame should be FA7 and by 1959 was 400+ in front of the engine number.

60 went to DA10R engine and GA7 frame prefix's

Photo's would make it clearer.

Re: A10 numbers
kommando #817189 07/23/20 6:09 pm
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thank you,, The seller went onto say while a 61 motor is 59 due to over production of 59 motors

[img]https://scontent-iad3-1.xx.fbcdn.ne...136f23548f8232e1c7019231&oe=5F3F32C4[/img]

Last edited by Cheyenne; 07/23/20 6:19 pm.
Re: A10 numbers
Cheyenne #817219 07/23/20 8:33 pm
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Sounds like bullshyte to me. Frame and engine numbers didn't match except by pure accident prior to the change about December 65.

59 engine is CA10R

61 frame is GA7

61 engine is DA10

I have never, ever heard that story that they made too many engines in 59.....


Never underestimate the human ability to elevate stupid to a whole new level!.
Re: A10 numbers
Rich B #817220 07/23/20 8:35 pm
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Originally Posted by Rich B
Sounds like bullshyte to me. Frame and engine numbers didn't match except by pure accident prior to the change about December 65.

59 engine is CA10R

61 frame is GA7

61 engine is DA10

I have never, ever heard that story that they made too many engines in 59.....


Nor have I hear that story,, adn was told they match waiting of frame photo

Last edited by Cheyenne; 07/23/20 8:36 pm.
Re: A10 numbers
Cheyenne #817230 07/23/20 9:24 pm
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Something I have just learned. My fathers Golden flashes (58 and 59) are DA10, I would have thought the SR Would have followed suit but upon checking up they didn’t till 60 as mentioned here. The DA motors were supposed to have had the large journal crank, just seems weird that those would
Go on a flash but not an SR... that said in the Pyke
memoirs there is mention that the smaller journal cranks put out 2hp more than the big journal cranks.


Now let’s all have a beer beerchug

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71’ A65 823 Thunderbolt (undergoing restoration)
67’ D10 sportsman (undergoing restoration)
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Re: A10 numbers
Cheyenne #817246 07/23/20 10:50 pm
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Okay got the frame number from them GA719947

Re: A10 numbers
Cheyenne #817249 07/23/20 11:05 pm
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Hi All,
The last number 7 on the cases looks to be a different font to my eyes?
Usually the HHC is stamped in smaller letters than the engine number (in my experience)

John

Re: A10 numbers
Cheyenne #817260 07/24/20 12:24 am
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That said---in those days the SR was a sports bike, nearly always ridden solo.
However the A10s often hauled sidecars--some of them big double adult chairs and the motors had arguably a more strenuous life.
I speak from first hand experience as I had both a 1954 golden Golden Flash and a 1962 A10 with sidecars attached.
Those motors were typically lugged a lot as compared with a free revving SR.
Just my two cents worth.

Re: A10 numbers
Tridentman #817273 07/24/20 1:42 am
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Originally Posted by Tridentman
That said---in those days the SR was a sports bike, nearly always ridden solo.
However the A10s often hauled sidecars--some of them big double adult chairs and the motors had arguably a more strenuous life.
I speak from first hand experience as I had both a 1954 golden Golden Flash and a 1962 A10 with sidecars attached.
Those motors were typically lugged a lot as compared with a free revving SR.
Just my two cents worth.


Not sure what that means in relationship to the question ?

Re: A10 numbers
Cheyenne #817286 07/24/20 7:18 am
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It's the internet, just like a pub quiz not all the answers are strictly relevant but the beer is free.

Touch and barge pole would be my advice.

Re: A10 numbers
Cheyenne #817287 07/24/20 7:24 am
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Originally Posted by Cheyenne
Originally Posted by Tridentman
That said---in those days the SR was a sports bike, nearly always ridden solo.
However the A10s often hauled sidecars--some of them big double adult chairs and the motors had arguably a more strenuous life.
I speak from first hand experience as I had both a 1954 golden Golden Flash and a 1962 A10 with sidecars attached.
Those motors were typically lugged a lot as compared with a free revving SR.
Just my two cents worth.


Not sure what that means in relationship to the question ?

I think it was relevant to the DA motors having big journal cranks as I mentioned earlier.


Now let’s all have a beer beerchug

68’ A65 Lightning “clubman”
71’ A65 823 Thunderbolt (undergoing restoration)
67’ D10 sportsman (undergoing restoration)
68’ D14 trials (undergoing transformation)

Re: A10 numbers
Cheyenne #817304 07/24/20 2:40 pm
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Apologies if I didn’t make my post clear in terms of its relevance.
I meant that the reason that the large journal cranks were first adopted on the “cooking” A10 rather than the sportier SR was the harder duty on the A10 fitted with sidecars— maybe prompted by different levels of warranty claims.
Not a fact— just a thinking out loud thought.

Re: A10 numbers
Cheyenne #817415 07/25/20 1:31 pm
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Modern motorccle rebirthers have no idea about the sequencing of British motorcycle engine & frame numbers.
As most of them are young then all their life everything they have driven or ridden has had matching numbers.
If it is for sale report it to the local police as having doctored numbers.
If you don't own it, keep it that way .


Bike Beesa
Trevor

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