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A7 / A10 Advice #18426 12/04/06 4:36 pm
Joined: Nov 2006
Posts: 52
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snatchpiece Offline OP
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I am looking to maybe purchase a 1950's British twin sometime in the new year (see my post in the Brit Bikes in General forum), after studying the prices of Triumphs, Nortons and BSA's it looks like it's going to be a BSA A7 or A10 but there's a couple of things I'd appreciate a bit of guidance with;

1. Plunger versus swinging arm, I understand that swinging arm was introduced to improve handling, so how bad is the handling on plunger models? will it affect me as I'm a fifty something who will staying within the legal speed limits and never riding on dual carrieways or trunk roads? (in other words just pottering about on country lanes and lesser A roads)

2. I get the feeling that the plunger models were still offered alongside the s/a models, was this for the sidecar fraternity? if so are late plunger models more liable to have been sidecar tugs? also are there any problems riding solo machines that used to be sidecar tugs?

3. I gather from my other post that spares should not really be a problem, however are there any bits that I should ensure are correct on the bike as an original might be hard to source?

4. Lastly are the any particular points to watch out for when buying A7 /A10's?

Sorry about all these questions but I do like to look before I leap.

Thanks in advance,

Snatch.


Early 1959 Triumph 5TA.
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Re: A7 / A10 Advice #18427 12/04/06 7:29 pm
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beezerbill Offline
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I,ve rode both..I think both are great...there's a A-7 with a side car on eBay right now..kind of cool..and yes BSA look the best..and are in most cases the fastest they have a lot of pull..Bill

Re: A7 / A10 Advice #18428 12/04/06 7:37 pm
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Alex Offline
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1. With a sprung saddle, the plunger is tolerable on rough roads. In terms of handling, it actually handles very well on smooth, dry roads, but hard cornering on wet or bumpy roads can get you in trouble. For comfort and handling, go swingarm, for nostalgia, go plunger.

2. I have heard that sidhack people preferred rigids and that the transitional plunger was to provide all the advantages of the rigid with a little more comfort (about 1" worth). The only problem with a bike that's been in sidehack service would be that it would have had lower gearing (different sprockets) and the wheel alignment would be different. Both can be corrected.

3. Sheetmetal can be very hard to source for early models, though you would probably have more luck in the UK.

4. Look for a solid, complete bike with as much original sheetmetal as possible. Things like magnetos, speedometer, and generator are not hard to get, but can be quite expensive to replace.

Good luck.


A smattering:
'53 Gold Flash
'67 Royal Star
'71 Rickman Metisse
'40 Silver Star
'37 Rudge Special
sixtyseventy Lightboltrocket road racer...and many more.
Re: A7 / A10 Advice #18429 12/05/06 7:44 am
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pooch Offline
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gday Alex,

why would the wheel alignment be different?


56 B31 with B33 barrel
51 Golden Flash with Dusting sidecar
Re: A7 / A10 Advice #18430 12/05/06 12:28 pm
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Mark Parker Offline
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First bike I owned was a plunger A10, 1950 model I think. They are interesting to ride with a spring seat on rough roads, if pushed in turns, the bike sort of does one thing and the rider and spring seat another. But they can be sweet running and get along quite well. The one I had had 6.5-1 compression and we made it a bit higher, I think it was that low because of the fuels available just after WW2. If I was going to have an A10 I think I'd prefere the plunger model because I like the older look.


mark
Re: A7 / A10 Advice #18431 12/05/06 1:27 pm
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Alex Offline
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Pooch, typically, only the sidecar wheel is toed in, but I've heard of toeing the rear wheel in to adjust for some of the torque steer present. While the BSA manuals don't seem to mention this, the manual that came with a friends Ural suggested it.


A smattering:
'53 Gold Flash
'67 Royal Star
'71 Rickman Metisse
'40 Silver Star
'37 Rudge Special
sixtyseventy Lightboltrocket road racer...and many more.
Re: A7 / A10 Advice #18432 12/05/06 3:17 pm
Joined: Aug 2001
Posts: 7,804
triton thrasher Online Content
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I wouldn't toe in the bike's wheel at the expense of chain alignment.

Sidecar work gradually mis-aligns the entire bike.


Amateur Loctite enthusiast.
Re: A7 / A10 Advice #18433 12/05/06 4:25 pm
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Alex Offline
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Quote
Originally posted by triton thrasher:
I wouldn't toe in the bike's wheel at the expense of chain alignment.
You got a point there, thrasher. I guess it's o.k. on a shaft drive URinAL...but of no merit here.


A smattering:
'53 Gold Flash
'67 Royal Star
'71 Rickman Metisse
'40 Silver Star
'37 Rudge Special
sixtyseventy Lightboltrocket road racer...and many more.
Re: A7 / A10 Advice #18434 12/05/06 10:24 pm
Joined: Jul 2004
Posts: 346
pooch Offline
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Just one small point is the suspect oiling system and the need for regular oil changes and preferably a return filter.

A swingarm oil tank will leave all the crap in the oiltank below the filter/drain plug.

At least you get all the oil out with a plunger tank with the filter drain at bottom.

The swingarm is a nicer looking bike from the left, but if you are just pottering around, the choice is yours.


56 B31 with B33 barrel
51 Golden Flash with Dusting sidecar
Re: A7 / A10 Advice #18435 12/05/06 10:48 pm
Joined: Feb 2002
Posts: 246
GOLD S-TARvin R.I.P. Offline
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Pooch writes:
"A swingarm oil tank will leave all the crap in the oiltank below the filter/drain plug."

This brings to mind a smart mod, done by buddy quite a few years back. He welded in a clean and neat drain plug at the bottom of the oil tank. Wish I had a picture to show you.


GOLD S-TARvin
OVBSAOC # 1625
1960 DBD34 Gold Star
1956 DB34 Gold Star
1969 Bonneville
several basket case Triumphs
Re: A7 / A10 Advice #18436 12/06/06 9:57 am
Joined: Sep 2006
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LJ. Offline
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Hey Snatch!

Where abouts are you in South West Lincolnshire? Stamford, Bourne? I live on the South Lincs border just on the river W place called MD. PM me and maybe we can meet up. There are a lot of guys local who have A10s and there is one that might just come up for sale in the spring next year. A real beauty!


LJ.
*******
1940 BSA M20 500cc Girder/Rigid- In Bits!
1947 BSA M21 600cc Girder/Rigid-Green
1949 BSA A7 500cc Girder/Plunger Star Twin-Black
1953 BSA B33 500cc Teles/Plunger-Maroon
1961 BSA A10 650cc Golden Flash-Blue
1961 BSA A10 650cc Golden Flash-Red
Re: A7 / A10 Advice #18437 12/07/06 9:25 pm
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pooch Offline
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Yeh GSTarvin, in hindsight, when I had oil tank in bare metal before paint, I would have welded in a drain plug if I had of realised.

A bit late when it's all painted/ decal/ed and cleared over.


56 B31 with B33 barrel
51 Golden Flash with Dusting sidecar

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