Author Topic: A7 - the degree of originality  (Read 269 times)

Offline JackB

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A7 - the degree of originality
« on: 14.09. 2021 00:17 »
Hello everyone,
I have the opportunity to start my adventure with BSA motorcycles by purchasing the A7 shown in the attached photos.  A kind request to experienced persons to specify the degree of originality of this particular vehicle, including the authenticity and compatibility of the frame and engine numbers.
Regards
Jack
Poland

Offline WozzA

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Re: A7 - the degree of originality
« Reply #1 on: 14.09. 2021 07:39 »
It appears to be a 1949 Rigid...  BUT I'm not sure what the R in the frame number means?    *conf2*

'51 Golden Flash Plunger
'57 Golden Flash Swingarm

Melbourne
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Offline Swarfcut

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Re: A7 - the degree of originality
« Reply #2 on: 14.09. 2021 08:06 »
   It has more original features than many of this age. Looks to have had sensible upgrades to suit use rather than show. Side stand should be clamp on type, not mounted on a frame lug.

 Represents an interesting excursion into the layby of life, rather than an adventure...... Some spare parts are unique and comparatively rare. Can be a real treasure hunt. Docile, smooth and worth preserving. Not many left, but not highly sought after either. Shame about the grind off on the frame.

 Swarfy.

Online Greybeard

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Re: A7 - the degree of originality
« Reply #3 on: 14.09. 2021 09:48 »
It appears to be a 1949 Rigid...  BUT I'm not sure what the R in the frame number means?    *conf2*
Rigid frame maybe?
Greybeard (Neil)
1955 Golden Flash, sprung frame
Supporter of THE DISTINGUISHED GENTLEMAN'S RIDE https://www.gentlemansride.com

Warwickshire UK


A Distinguished Gentleman Riding his 1955 Plunger Golden Flash

Online berger

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Re: A7 - the degree of originality
« Reply #4 on: 14.09. 2021 10:38 »
just had a scan of roy bacons bible and it doesn't show any R's in the frame numbers for those early frames *dunno*

Online Rex

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Re: A7 - the degree of originality
« Reply #5 on: 14.09. 2021 12:17 »
You'd be there a long time if you were to count Roy Bacon's inaccuracies though. ;)

Online muskrat

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Re: A7 - the degree of originality
« Reply #6 on: 14.09. 2021 20:28 »
G'day Fellas.
This link supplied by Billybream http://classicenglishbikes.com/tech_file/bsa.html shows 1949 A7 Rigid as ZA7R.
Cheers
'51 A7 plunger, '57 A7SS now A10CR,  '83 CB1100F, 88 FXST .
Australia
Muskys Plunger A7

Online trevinoz

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Re: A7 - the degree of originality
« Reply #7 on: 14.09. 2021 22:52 »
I think that the "R" was added when the plunger frame was introduced.
As we all know, plunger frames have an "S".
The tank is probably from a later model by looking at the fuel taps.

Offline Sav

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Re: A7 - the degree of originality
« Reply #8 on: 15.09. 2021 08:51 »
Nice bike, more original than many I've seen, good acquisition on the surface.

I don't think the tank is off a later model, but am not sure when BSA switched to the later bigger rear lights

Not fond of cow horn bars but the only minor thing I could not live with are those belisha beacons sitting on the spark plugs!
1961 A10SR, spent a fortune at SRM
1961 A7SS, finally the right green
2011 New addition 1937 Empire Star, twin port, high pipes. Turned out to be the most unreliable bike I have handled.
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White Cliffs Country

Offline Swarfcut

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Re: A7 - the degree of originality
« Reply #9 on: 15.09. 2021 09:30 »
 Early versions of the A7 rigid have a one piece frame. The introduction of the spring or plunger frame enabled BSA to use the original headstock, top, saddle and down tubes, with a bolt on plunger or rigid rear to suit the model.

 Curiously the R for rigid does not appear in my later BSA parts books frame listings (nor in Roy Bacon's publications),  tho' the S for "spring" does. Billy's file only shows the R for one year, 1949. Are all rigid frames marked with an R for all years ?  The font on this frame looks different to my eye.

 Angus. Rear light is a modern and sensible upgrade. Original is a true candle in the wind.

 Sav. Fuel taps on Longstrokes are said to point slightly to the rear. Dunno if this is an urban myth! Reckon Trev knows.

 C'mon Jacko, tell all.

 Swarfy.