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Forum wisdom required....

Evening chaps,
Whose up for a challenge?!
Almost there with my rebuild and will have my WM20 running very soon. BUT during the journey I have established that it was delivered in very early January 1940, and subsequently rebuilt in late 44, so the full spread of parts are in evidence.
What I need a hand with is building a shopping list of things that I need to look out for to restore it as near as damn it back to the 40 spec.
I have a front mudguard with the number plate rib, also have a valanced rear that needs some tlc from a mig welder (not sure if it would have had that though). I also have a ballon tank I am repairing in slow time.
So, what else do I need (I am in no rush, this is a slow burner for one winter when I eventually have all I need)??

PS I have this idea to build a matrix by calendar month over the years so others may find this out easier in the future, what do we think, worth the effort?
Cheers
Scott

PPS whose going to Kempton in September?

Re: Forum wisdom required....

Do you have the correct rear frame, if so it may be possible, but someone has been pushing prices of early bits up a lot recently.

Rob

email (option): robmiller11(a)yahoo.co.uk

Re: Forum wisdom required....

Fortunately Rob I do, also forgot to mention I have the clamp on pillion pegs.
The big things I think I know but I would like to both confirm and learn.

Re: Forum wisdom required....

These early machines had a top yoke with rubber bushes to dampen the handlebars, and when did they change to the longer forks?

Obviously there is going to be a long list of little changes many of which there may not be a definitive answer on exactly when it changed, but its certainly worth the attempt.

Rob

email (option): robmiller11(a)yahoo.co.uk

Re: Forum wisdom required....

Rob Miller
These early machines had a top yoke with rubber bushes to dampen the handlebars, and when did they change to the longer forks?

Obviously there is going to be a long list of little changes many of which there may not be a definitive answer on exactly when it changed, but its certainly worth the attempt.

Rob

I spoke at length with Henk about a year ago about the forks. He said:-

"The first photo that clearly doesn't have a brake rod and is a BSA with frame number WM20.25307, this BSA seems to have the front mudguard spacer fitted"

Which I think must put the change to long forks at some point in 1941.

Ron

email (option): ronpier@talk21.com

Re: Forum wisdom required....

A couple of points - I think you may need to find a side damper nut as opposed to the side damper wheel + some rubber driver's footrests terminating with circular steel discs - you may also need to mount the speedo centrally as opposed to off set but those brackets I do not think are hard to find. I am sure there are plenty of folk on here who could compile a comprehensive list.

Re: Forum wisdom required....

I have an October 41 project bike which had
Short forks
Bakelite side damper knob
Brake rod
Ribbed rear mudguard
Balloon tank
8” headlight
Standardised levers
No footrests but possible to use solid or rubber as the changeover took place then
Rear frame had no footrests
Rear frame had side stand lug

Although built in 41 - the frame no sequence was from mid 1940
Early parts - some - appeared later than some of us may think

Br
Jo’b

email (option): jonnyob1@googlemail.com

Re: Forum wisdom required....

John would your frame number be earlier that that quoted by Henk?

Ron

email (option): ronpier@talk21.com

Re: Forum wisdom required....

https://ibb.co/VQF60MT

Am I right in thinking that the speedo drive would be on the left as on the later bikes but still having the rod front brake, therefore no brake cable adjuster "post" on the plate.
Mike W

email (option): mickwalsh57@gmail.com

Re: Forum wisdom required....

Hi Michael

Left mounted speedo was introduced with 1940 W models in Late 1939

Speedo remained centrally mounted as with earlier K series

The front brake plate on the 41 bike I have had no cable adjuster as would be expected with a brake rod

Br
Jo’b

email (option): jonnyob1@googlemail.com

Re: Forum wisdom required....

https://ibb.co/rbW9YnT
I hope the picture works this time

email (option): mickwalsh57@gmail.com

Re: Forum wisdom required....

I took the liberty of posting your picture Michael. Ron
SAM-2143

email (option): ronpier@talk21.com

Re: Forum wisdom required....

Thanks Ron.
Mike W

email (option): mickwalsh57@gmail.com

Re: Forum wisdom required....

In one of the posts I remember seeing the Saddle Bolts/Studs were different for the early BSAs to accommodate the Horn.
Please validate my understanding

Pratap Henry

email (option): prataphenry@gmail.com

Re: Forum wisdom required....

Correct Pratap. The left side saddle spring stud has a flat with a hole to hang the horn from. Ron
C4347367-2

email (option): ronpier@talk21.com

Re: Forum wisdom required....

Yes this is the left hand bolt, other side has a standard hex head I think?

Rob

sad-bolt

email (option): robmiller11(a)yahoo.co.uk

Re: Forum wisdom required....

Did all of the WM20's have horn in that location, as I have seen some mounted in front between engine and frame.

email (option): tknalder@iinet.net.au

Re: Forum wisdom required....

Kim,

No not all M20's had the horn located there. According to the historic facts, the horn was relocated sometime in 1942. I don't know the reason, but I have heard, that the horn couldn't be heard when the rider was wearing the long mac, whether that's true or not.

email (option): jeepfinger@blueyonder.co.uk

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