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BSA WM20 early top yoke and foot rests

I am in the market for an early top yoke and also early foot pegs for my 1940 WM20 and have the following that I am happy to trade with a cash adjustment either way:

1, DU42 headlight assy with supports (no switch, ammeter or switch panel), original shell with NOS black rim, frosted NOS glass and a MU42 reflector, shell painted green.

2, A Lycett front spring pillion seat with cover for restoration (a rare beast apparently), I had it in a electrolysis bath for a while which freed up the hinges and it is in solid condition but would need more soak time to clean it up. Once I discovered I had bought the wrong type for a WM20 I stopped work on it.

So what do you have lurking under that bench, don't be shy?!

Scott

email (option): larkesrAATgmail.com

Re: BSA WM20 early top yoke and foot rests

Hi Scott,
I may be able to help. I have sent you an email.
Regards
Brendan.

Re: BSA WM20 early top yoke and foot rests

i try sending email but error
i can help u

email (option): sl_hussein@yahoo.com

Re: BSA WM20 early top yoke and foot rests

The easy bit.

https://pesltd.uk/?product=66-5138

Mark

email (option): pes.sales@btconnect.com

Re: BSA WM20 early top yoke and foot rests

Mark by early, he probably means the rubber mounted handlebar. Ron

email (option): ronpier@talk21.com

Re: BSA WM20 early top yoke and foot rests

I do indeed Ron!
Still looking everyone, not in a rush, happy to meet up at founders day if people want to save extortionate postage for heavy stuff.

Re: BSA WM20 early top yoke and foot rests

Just in case the part numbers might help. Ron

email (option): ronpier@talk21.com

Re: BSA WM20 early top yoke and foot rests

Thanks for the part numbers, Ron.

Does anyone know of a supplier for the large nuts (15-5285) that fix the handlebar damper rubbers? I have a salvaged pair awaiting replating, but would like some good 'uns.

Re: BSA WM20 early top yoke and foot rests

As you have originals, I would think that anyone with a lathe and the right hex bar could easily make copies....Mark? Ron

email (option): ronpier@talk21.com

Re: BSA WM20 early top yoke and foot rests

Hi Craig
I have the following here
1 x set of retaining nuts - chrome plated
1 x set of locking tab washers - un plated
1 x set of modern shock absorber rubbers

It’s the last of what I had made in U.K.
if interested drop me a line

Jo’b

email (option): Jonnyob1atgooglemail.com

Re: BSA WM20 early top yoke and foot rests

Thanks John. Will do.

Craig

Re: BSA WM20 early top yoke and foot rests

All I have for the rubber mount yoke is these.

https://pesltd.uk/?product=15-5281

Mark

email (option): pes.sales@btconnect.com

Re: BSA WM20 early top yoke and foot rests

Ron Pier
As you have originals, I would think that anyone with a lathe and the right hex bar could easily make copies....Mark? Ron
They would be easy Ron.

Mark

email (option): pes.sales@btconnect.com

Re: BSA WM20 early top yoke and foot rests

Well since Scott seams to have missed out on the parts that John has, maybe Craig could send you his original nuts to copy to go with your washers?

When I built my 39 Speedtwin, I bought the handlebar rubbers off Jeff Hunter (the rubber man) But the rubber or Neoprene that he uses was far too soft and just squidged out the sides as I tightened the nuts. So I visited a firm in Southampton who specialise is various forms of rubber components. They pressed me out some doughnuts the correct size from some sheet material. It must have been 1/2" or 5/8"? thick and clamped up perfectly. Ron

email (option): ronpier@talk21.com

Re: BSA WM20 early top yoke and foot rests

Hi Scott,

Yes, if my salvaged nuts are of use, let me know.

C

email (option): cmmacd @ hotmail.co.uk

Re: BSA WM20 early top yoke and foot rests

Thanks for all the inputs chaps, after getting a lead I have secured a top yoke. It’s showing it’s age but I can sort that out.
Can anyone tell me what the thread size the big nuts are??

Re: BSA WM20 early top yoke and foot rests

This puzzle is fun and games.
15-5281 is the inner washer so that the outer tab is not obvious.
15-5284 is the outer washer.
So, the arms must be on the correct sides.
15-5285 is the nut.
I have now seen a locking washer for the nut.
Is this a BSA part? I can't find it in any parts book.

Mark

email (option): pes.sales@btconnect.com

Re: BSA WM20 early top yoke and foot rests

Hi all,

I don't know the part number, but have a pair of repro lock washers from John O'Brien. I'll post a photo later. They're dished to allow the edge to be flattened against the nuts. I suspect thread lock may do the job just as well.

BTW I'm in the process of whittling and tapping a pair of post-war footrests for my 1940 WM21. Not de luxe, but will have the big washers that secure the rubbers.

Re: BSA WM20 early top yoke and foot rests

Mark 15-5284 is listed in the 39 parts list as "handlebar damper nut locking washer x2" Ron

email (option): ronpier@talk21.com

Re: BSA WM20 early top yoke and foot rests

I think I've finally got there Ron.
Too many people with the best intensions giving me duff info.
I see now there isn't an inner washer, the rubber butts up to the casting.

Mark

email (option): pes.sales@btconnect.com

Re: BSA WM20 early top yoke and foot rests

No Mark. 15-5281x2 are the inner washers. 15-5284x2 are the outer (locking) washers.
Here are the relevant pages. Ron


email (option): ronpier@talk21.com

Re: BSA WM20 early top yoke and foot rests

These are they (hopefully):


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20250626-204307

Re: BSA WM20 early top yoke and foot rests

I have patterns in my hand now.
The terminology is bad.
The inner washers go on the outside of the handlebar mounts!

Mark

email (option): pes.sales@btconnect.com

Re: BSA WM20 early top yoke and foot rests

I assumed by the description that there is a steel washer each side of the rubber doughnut?? Ron

email (option): ronpier@talk21.com

Re: BSA WM20 early top yoke and foot rests

That's the mistake I made Ron.
It was pointed out to me that the grooves in the yoke don't go all the way to the shoulder.
So I'm guessing the reference to "inner" means inside of the nut.
With the locking washer between.
The example of the locking washer I have, has been chrome plated.
I think the nickel and chrome will need to be very thin.

Mark

email (option): pes.sales@btconnect.com

Re: BSA WM20 early top yoke and foot rests

You're correct Mark. The rubber doughnut sits against the handlebar support bracket. The chrome washer goes next, then the thin lock washer, then the nut.

Re: BSA WM20 early top yoke and foot rests

Yep indeed Mark. You can even see the grooves are short in the illustration. Ron

email (option): ronpier@talk21.com

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