Author Topic: Every Modifications for the BSA A10  (Read 863 times)

Online terryg

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Re: Every Modifications for the BSA A10
« Reply #15 on: 05.11. 2019 21:13 »
Some suggestions for Anthony's Pandora's box of mods...

Bronze bush replacements for the silentblocs in the swinging arm. Mostly to overcome poor quality in newly manufactured parts.

Also, has anyone mentioned Dow type damping 'valves' for the front forks? Or progressive springs?

And what about modern sealed bearings for the hubs?

Never mind the myriad stainless bits, nuts and bolts!
Terry
'57 'SR', '59 SR, '63 RGS

Offline coater87

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Re: Every Modifications for the BSA A10
« Reply #16 on: 05.11. 2019 23:03 »
 These bikes get pricey very fast if you skimp on nothing- but good lord they are cool.

 Lee
Central Wisconsin in the U.S.

Online mikeb

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Re: Every Modifications for the BSA A10
« Reply #17 on: 06.11. 2019 02:16 »
Is there a balance to keep here – between what makes it a more reliable/ridable A7/A10 vs when does it stop being an A7/A10. Fit a Suzuki clutch, Suzuki front end, 2x belt drives, TT gearbox, a million SRM good things, shocks front and back, athlon, BTH, DVR2, LEDs, thunder rods, bronze swing arm bushes, modern rims. Or just buy a modern? We’ll each have our own answer to this.

When I start scheming too much about how to make my B33 faster and corner better I sometimes try and remind myself that I love it because of what it is and isn’t
New Zealand
'61 Super Rocket  - '47 B33 -  '18 Triumph Street Triple RS

Online Rocket Racer

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Re: Every Modifications for the BSA A10
« Reply #18 on: 06.11. 2019 03:46 »
Is there a balance to keep here – between what makes it a more reliable/ridable A7/A10 vs when does it stop being an A7/A10. Fit a Suzuki clutch, Suzuki front end, 2x belt drives, TT gearbox, a million SRM good things, shocks front and back, athlon, BTH, DVR2, LEDs, thunder rods, bronze swing arm bushes, modern rims. Or just buy a modern? We’ll each have our own answer to this.

When I start scheming too much about how to make my B33 faster and corner better I sometimes try and remind myself that I love it because of what it is and isn’t

There is a lot to be said for not overcapitalising all bikes. Its quite possible to make the old six spring clutch work reliably with a bit of effort and there is satisfaction in that.  My race engine takes a lot of abuse so I spend a lot of money on it which it absorbs while staying together. Given I recall an SRM oil pump is currently around 300GBP we're not talking peanuts to do a decent or full rebuild.
On a good sporting road A10 what would I do to the engine? clean the sludge trap, assess the wear and replace as little as possible. Then I'd keep the oil clean, ponder reliable electrics (my personal kryponite) and use it.
On my super rocket I did upgrade the front brakes as I dont rate the 8" SLS FWH from 58-63
My 54 RR was very tired so has had to have a rebore and crank grind but will still have a plain bush crank. Havent decided which clutch it'll get, might keep the six spring or fit a BNR (worlds apart!)

I have been extremely impressed by my race belt drive primary.
A good rider periodically checks all nuts and bolts with a spanner to see that they are tight - Instruction Manual for BSA B series, p46, para 2.
New Zealand

Offline Tomcat

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Re: Every Modifications for the BSA A10
« Reply #19 on: 06.11. 2019 06:43 »
I went up one tooth on the gearbox sprocket and highly recommend that mod, less revs at 100k's.
'48 A7 '59 SR '74 850 Commando TDM900

Online Greybeard

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Re: Every Modifications for the BSA A10
« Reply #20 on: 06.11. 2019 09:00 »
I went up one tooth on the gearbox sprocket and highly recommend that mod, less revs at 100k's.
Oh yes, me too!

Offline Peter in Aus

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Re: Every Modifications for the BSA A10
« Reply #21 on: 06.11. 2019 23:16 »
I went up one tooth on the gearbox sprocket and highly recommend that mod, less revs at 100k's.
Oh yes, me too!

Me to *smile*

Busselton West Australia
49 A7 longstroke
58 A10  SA

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Re: Every Modifications for the BSA A10
« Reply #22 on: 07.11. 2019 09:21 »
Elongating the magneto flange holes to allow for final ignition timing adjustment.

Online RoyC

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Re: Every Modifications for the BSA A10
« Reply #23 on: 07.11. 2019 18:39 »
I went up one tooth on the gearbox sprocket and highly recommend that mod, less revs at 100k's.

I changed the engine sprocket because IIRC, changing the gearbox sprocket upsets the speedo.
My bike is a 1958 A7SS
Stafford UK

Online JHG1958

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Re: Every Modifications for the BSA A10
« Reply #24 on: 07.11. 2019 20:42 »
Here is good web page with improvements.  It missed out electronic ignition.

https://cybermotorcycle.com/archives/bsa-super-rocket/improve.htm

Online Greybeard

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Re: Every Modifications for the BSA A10
« Reply #25 on: 08.11. 2019 00:15 »
I went up one tooth on the gearbox sprocket and highly recommend that mod, less revs at 100k's.

I changed the engine sprocket because IIRC, changing the gearbox sprocket upsets the speedo.
Can't do that on  a Plungie cos you cannot buy the duplex engine sprockets. I had the speedo recalibrated.

Online RoyC

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Re: Every Modifications for the BSA A10
« Reply #26 on: 08.11. 2019 17:14 »
I went up one tooth on the gearbox sprocket and highly recommend that mod, less revs at 100k's.

I changed the engine sprocket because IIRC, changing the gearbox sprocket upsets the speedo.
Can't do that on  a Plungie cos you cannot buy the duplex engine sprockets. I had the speedo recalibrated.

I know nothing about plungies but there are some duplex sprockets here.   

https://www.ebay.co.uk/sch/i.html?_from=R40&_trksid=m570.l1313&_nkw=bsa+duplex+engine+sprockets&_sacat=0
My bike is a 1958 A7SS
Stafford UK

Online BSA_54A10

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Re: Every Modifications for the BSA A10
« Reply #27 on: 09.11. 2019 10:06 »
Plungers, just like swing arm & rigid A 10's have a cush drive on the primary.
The plunger was unique amongst BSA's in using a duplex cush drive .
All of the duplex sprockets with splines are for latter engines with a cush in the clutch.
Bike Beesa
Trevor

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Re: Every Modifications for the BSA A10
« Reply #28 on: 09.11. 2019 10:40 »
The plunger was unique amongst BSA's in using a duplex cush drive .
And triplex in overseas versions I think.

Online morris

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Re: Every Modifications for the BSA A10
« Reply #29 on: 11.11. 2019 16:10 »
Gearbox sprocket nut with oil seal.
Although only available for SA models, highly recommended. No more oily rear tyre
http://shop.srmclassicbikes.com/product/gearbox-sprocket-nut-oil-seal-bsa-pre-unit-swingarm-models
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'52 BSA A 10 Plunger
'55 MORRIS ISIS
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