Author Topic: What year are these numbers?  (Read 1126 times)

Offline Frenchy

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What year are these numbers?
« on: 03.02. 2010 22:00 »
Engine: CA7 4239
Frame: BA7 7978

I've found a link to a tech sheet that lists a lot of BSA engine/frame numbers, but it is not complete.  Can anyone help?
1957 A7 bobber, swing arm
Columbus, Ohio, US

Online trevinoz

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Re: What year are these numbers?
« Reply #1 on: 04.02. 2010 08:26 »
I reckon the frame might be 1953 but should have an "S" suffix.
The engine looks like 1956/7.
They definitely don't belong together as the frame is plunger and the engine is swinging arm, if the numbers are original.
Trev.

Offline brackenfel

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Re: What year are these numbers?
« Reply #2 on: 04.02. 2010 10:33 »
This is what I've used in the past when looking at bikes on Ebay etc.. Also helped me check mine out before I bought it!!:-

http://www.britishonly.com/tech/tips/framenumbers.asp

Hope this helps..

Adrian
1961 A10 650 Golden Flash - Blue
1954 BSA B33
Velocette Viper
Laverda 750 SF1
Kawasaki W650
Buell XB9S
Ariel 350NH & Matchless G3LS in bits...

Offline Frenchy

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Re: What year are these numbers?
« Reply #3 on: 04.02. 2010 15:21 »
I misread my frame number...  It begins with "E" not "B".  

I found that same link, Adrian, but it is incomplete and doesn't account for my numbers. I found another link online last night that has a better, more complete, BSA serial number listing.  According to it my frame and engine both appear to be '57's.  http://www.bsaownersclub.co.uk/Engine_Frame_Listing.html#1950  

My numbers are slightly lower than what's listed, but I'm going to assume they're both from '57.
1957 A7 bobber, swing arm
Columbus, Ohio, US

Offline dpaddock

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Re: What year are these numbers?
« Reply #4 on: 04.02. 2010 22:09 »
Roy Bacon's "BSA Twin Restoration" has both numbers as 1957.

David
David
'57 Spitfire


Offline Bender

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Re: What year are these numbers?
« Reply #5 on: 06.02. 2010 06:00 »

Are you sure you haven't got a "56" engine in a "57" frame? The "57" year started with CA7 4269.

Maybe they came out of the factory assembled together, after they found the engine laying in the corner somewhere after the end of year clean-up? *smile*