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#598800 - 05/10/15 2:25 pm BSA Speedo **  
Joined: May 2015
Posts: 3
Thomas MS Offline
BritBike Forum member
Thomas MS  Offline
BritBike Forum member

Joined: May 2015
Posts: 3
Hamburg, Germany
Hi,

I just got a 1964 A50. The speedo is broken and was anyway an indian replica The speedo is driven from the crankcase, not from the rearwheel.

Can anybody recommend a good speedo with a correct gear ratio?
Or maybe the correct ratio at least?

I was looking around but can find only stuff for the rear wheel driven later models 1966 and younger.

Many thanks in advance smile

Thomas


BSA A50, before OIF Bonnie
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#598950 - 05/11/15 10:57 am Re: BSA Speedo [Re: Thomas MS]  
Joined: Sep 2002
Posts: 7,812
Alex Offline
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Alex  Offline

BritBike Forum member

Joined: Sep 2002
Posts: 7,812
Seattle
Your bike would originally have had a grey-face chronometric (SC3313/00 in miles, SC3313/00 in km), but those are pretty rare. Your best route is probably to find a useable chronometric speedometer and have it rebuilt with a reproduction face and the correct ratio. I don't remember the correct ratio off the top of my head, but I believe 1600 revs/mile (1000 revs/km) is correct.


A smattering:
'53 Gold Flash
'67 Royal Star
'71 Rickman Metisse
'40 Silver Star
'37 Rudge Special
sixtyseventy Lightboltrocket road racer...and many more.
#598973 - 05/11/15 12:33 pm Re: BSA Speedo [Re: Alex]  
Joined: Aug 2001
Posts: 1,816
Steve Erickson Offline
Steve Erickson  Offline


Joined: Aug 2001
Posts: 1,816
The Northwoods... Michigan
Are you sure, Alex? I thought that all the BSA line switched to magnetic instruments at the start of the 64 model year...?

#598981 - 05/11/15 12:50 pm Re: BSA Speedo [Re: Thomas MS]  
Joined: May 2015
Posts: 3
Thomas MS Offline
BritBike Forum member
Thomas MS  Offline
BritBike Forum member

Joined: May 2015
Posts: 3
Hamburg, Germany
Hi Alex, Hi Steve,

Thanks very much for your help. I think I will try a replica speedo, but a better one this time.
Thats why i need the gear ratio, there are quite some on the market.
Any ideas?

Greetings from Hamburg

Tom


BSA A50, before OIF Bonnie
#598990 - 05/11/15 1:29 pm Re: BSA Speedo [Re: Thomas MS]  
Joined: Dec 2004
Posts: 8,890
kommando Online content
kommando  Online Content


Joined: Dec 2004
Posts: 8,890
Scotland
Your gearbox ratio is much the same as the rear wheel gearbox ratio of 2:1 which means the speedo needs to be a 1600 revs per mile or 1000 per km as the rear wheel does 800 revs per mile or 500 revs per km. Not seen an aftermarket speedo covering that ratio.

#599000 - 05/11/15 2:22 pm Re: BSA Speedo [Re: Thomas MS]  
Joined: Sep 2002
Posts: 7,812
Alex Offline
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Alex  Offline

BritBike Forum member

Joined: Sep 2002
Posts: 7,812
Seattle
Steve, you're right. My bad...I thought I saw that this was for a '62 model.


A smattering:
'53 Gold Flash
'67 Royal Star
'71 Rickman Metisse
'40 Silver Star
'37 Rudge Special
sixtyseventy Lightboltrocket road racer...and many more.
#599099 - 05/12/15 8:54 am Re: BSA Speedo [Re: Thomas MS]  
Joined: Aug 2012
Posts: 664
Beach Offline
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Beach  Offline

BritBike Forum member

Joined: Aug 2012
Posts: 664
West Virginia, United States
An A50 Star takes SC 3313/00...The A50 cyclone took SSM 5001/03 (1600 2-1) which is readily available...I would purchase a used one and if it doesn't work, have it rebuilt...

Last edited by Beach; 05/12/15 9:08 am.

Bill
1974 Norton Commando
1966 Lightning
1965 Lightning Rocket
1966 Norton Atlas
1967 Norton Atlas
1948 Panhead
#599133 - 05/12/15 1:44 pm Re: BSA Speedo [Re: Thomas MS]  
Joined: May 2015
Posts: 3
Thomas MS Offline
BritBike Forum member
Thomas MS  Offline
BritBike Forum member

Joined: May 2015
Posts: 3
Hamburg, Germany
Hi all!

Thank you very much for your help! So I will try to get a speedo with a 2:1 ratio, of course preferred an original one.

Greetings from Hamburg

Tom


BSA A50, before OIF Bonnie
#599137 - 05/12/15 2:33 pm Re: BSA Speedo [Re: Thomas MS]  
Joined: Dec 2004
Posts: 8,890
kommando Online content
kommando  Online Content


Joined: Dec 2004
Posts: 8,890
Scotland
It won't have 2:1 written on it anywhere, you need one with 1600 in small letters on the outside edge of the face if its MPH, not sure the numbers on the Km/h version.

#599140 - 05/12/15 3:04 pm Re: BSA Speedo [Re: kommando]  
Joined: Feb 2003
Posts: 2,884
Rickman Online content
BritBike Forum member
Rickman  Online Content
BritBike Forum member

Joined: Feb 2003
Posts: 2,884
Ohio
Well,
I have two grey face chrono's, that are supposed to go onto the cowled or nacell type head lamp assemblies, because of the flanged bezel, it's numbers are:

SC 3313/02 1260

#599863 - 05/17/15 1:56 pm Re: BSA Speedo [Re: Rickman]  
Joined: Mar 2015
Posts: 79
Beezaster Offline
BritBike Forum member
Beezaster  Offline
BritBike Forum member

Joined: Mar 2015
Posts: 79
South-Carelia, Finland
Sorry to hijack this thread, but as it is rather convenient, I'll ask about this here.

Can anybody tell me how to tell apart chronometric an magnetic speedometers? I have a speedo that says "S.467/59/L CHRONOMETRIC SMITHS M.A. MADE IN ENGLAND" on the face. However, if I was asked, I would say the clock is operated by some kind of a magnetic system. Is the chronometric speedo mechanic, do I have some kind of a replica?

The speedo shows speed readings that are total nonsense and the odometer gives distances in miles that can be converted to kilometers By a coefficient of approximately 2,6 and it seems to work this way rather consistently.

Judging by the behaviour of the odometer it's easy to come to a conclusion that the speedo drive on the rear wheel hub might be too slow, but AFAIK this very clock has previously worked with an original Smiths 1,25:1 drive, which has since been replaced with a repro. Besides, wouldn't a 2:1 drive be even slower?

Last edited by Beezaster; 05/17/15 1:56 pm.

Some of them call me "Teddy"

'71 A65 Thunderbolt "The Killer Bee"
(Also the frustrated owner of a Triumph Spitfire 1500)
#599866 - 05/17/15 2:12 pm Re: BSA Speedo [Re: Thomas MS]  
Joined: Dec 2004
Posts: 8,890
kommando Online content
kommando  Online Content


Joined: Dec 2004
Posts: 8,890
Scotland
The Chrono has a clockwork mechanism, it moves in jerks or steps instead of having a smooth action like the Magnetic (assuming the magnetic is working as a lot don't).

This shows a tacho Chrono working

https://www.youtube.com/watch?v=c4n2dpK4Xfc

If the gearbox is wrong then the speedo readings will be wrong.

#600947 - 05/24/15 8:42 am Re: BSA Speedo [Re: kommando]  
Joined: Mar 2015
Posts: 79
Beezaster Offline
BritBike Forum member
Beezaster  Offline
BritBike Forum member

Joined: Mar 2015
Posts: 79
South-Carelia, Finland
Right, well there's definately no clockwork inside my speedo, so a knock off for sure. The drive gearbox is probably the wrong one, but even so, the speedo should still work logically, just giving too low readings. I went a short strech flat out in fourth gear last night and as I looked down at the speedometer it showed a steady 10 mph. I don't think that's correct.

I'm thinking of getting magnetic replica clocks (no tacho at the moment), but are they any good or just a waste of money?

Any experience on these for example?:
http://www.feked.com/speedometer-black-face-replica.html
http://www.feked.com/speedometer-grey-face-replica.html


Some of them call me "Teddy"

'71 A65 Thunderbolt "The Killer Bee"
(Also the frustrated owner of a Triumph Spitfire 1500)
#600988 - 05/24/15 2:32 pm Re: BSA Speedo [Re: Beezaster]  
Joined: Jul 2010
Posts: 219
DickDastardly Offline
BritBike Forum member
DickDastardly  Offline
BritBike Forum member

Joined: Jul 2010
Posts: 219
Lives in Devon, covered in oil
Personally, I would get any original Smiths speedometer, (doesn't matter how crap it is) send it to:

A.E. Pople, Speedo Repairs,
C/O A & E Coachworks,
The Vehicle Centre
Ashchurch Road,
Aldershot,
Hants,
GU12 6LX

Tell them the model you want it to be, they also supply the correct length cables, don't buy Indian cr4ppy ones, job done! It wont be cheap but then, as they say, "Buy cheap, buy twice"!

I supplied them with an old Norton Commando Rev counter that was garbage that I got for next to nothing and they turned it into a pristine 'Grey Face' A65 Rev counter that is spot on!



Last edited by DickDastardly; 05/24/15 4:58 pm. Reason: typo




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