BSA Owners' Club Workshop Discussions

The BSA Workshop => Singles => Topic started by: watts on 05 Feb, 2025, 09:56

Title: Font mudguard stay for Early A7/M20/B31 brake
Post by: watts on 05 Feb, 2025, 09:56
Hello

I have a 1952 M20 which has a Type 3 front brake (Draganfly name) which has the centre stay mount inline with fork leg and only on stay mounting point for front and rear stays. Does anyone know the part number for the forward stay?

Or do I modify a later on with a hammer!

Thanks
Matthew
Title: Re: Font mudguard stay for Early A7/M20/B31 brake
Post by: watts on 05 Feb, 2025, 09:57
Not my bike a picture of the web for illustration.
Title: Re: Font mudguard stay for Early A7/M20/B31 brake
Post by: TTJOHN on 06 Feb, 2025, 16:26
Quote from: watts on 05 Feb, 2025, 09:56 Hello

I have a 1952 M20 which has a Type 3 front brake (Draganfly name) which has the centre stay mount inline with fork leg and only on stay mounting point for front and rear stays. Does anyone know the part number for the forward stay?

Or do I modify a later on with a hammer!

Thanks
Matthew
That does not look right at all, I feel sure that if you had he correct hub you would see that there is another mounting point at the front, take a look at the parts book in the info section.
Title: Re: Font mudguard stay for Early A7/M20/B31 brake
Post by: cdsdorset2 on 06 Feb, 2025, 17:26
It does look correct. I built e very early B31 exactly the same. Had to make my own stays. Not hard with some tube and 2 spanners as a swage tool.
Title: Re: Font mudguard stay for Early A7/M20/B31 brake
Post by: rhyatt on 07 Feb, 2025, 06:44
I'm sure there should only be the central Y bracket and the rear stay on these forks
Title: Re: Font mudguard stay for Early A7/M20/B31 brake
Post by: watts on 07 Feb, 2025, 10:09
Hello All

Thank you for your help.

Matthew
Title: Re: Font mudguard stay for Early A7/M20/B31 brake
Post by: watts on 07 Feb, 2025, 10:18
Quote from: cdsdorset2 on 06 Feb, 2025, 17:26 It does look correct. I built e very early B31 exactly the same. Had to make my own stays. Not hard with some tube and 2 spanners as a swage tool.

It may come to that. Do you have any pictures because the centre stay is an issue the mounting bolts are in line with the leg.  I am not sure if I should fit the centre stay around the 'waist' on the curd so it sin line or keep the it where it is and add a 'fishplate' to the leg.  The guard that was fitted (ish) and is rather 'Heath Robinson'. I will try and work out how to add photo this. Thank you

Title: Re: Font mudguard stay for Early A7/M20/B31 brake
Post by: V500 on 08 Feb, 2025, 09:19
That's the (useless) 7" front brake and what would appear to be an Ariel front mudguard. The fork sliders should have a mudguard stay mounting lug in front of the wheel spindle for the front stays. Mine (51) has both front and lower stays plus the central Y piece going to the upper slider mounts.
 Bit of a mix-and-match going on here.
Title: Re: Font mudguard stay for Early A7/M20/B31 brake
Post by: V500 on 08 Feb, 2025, 09:41
Also, why does there appear to be a bolt and washer fitted to the end of the wheel spindle? I can't magnify the pic enough to see exactly what it is.
Title: Re: Font mudguard stay for Early A7/M20/B31 brake
Post by: watts on 09 Feb, 2025, 00:05
Yes the guard is wrong, which is the issue, the Y makes sense.
But all the images I see do not have that.
The fork is correct for early A7 B31/M20 etc Draganfly refer to it as a type 3.
The forward stay comes over the leg and fixes to the rear lug with rear stay.
As in the picture attached.
The previous picture is a bit odd but shows the stay which think is correct.
Thanks
Title: Re: Font mudguard stay for Early A7/M20/B31 brake
Post by: watts on 09 Feb, 2025, 07:39
I have found a better picture of the front guard stays.
It is the front and middle ones.
Thanks
Title: Re: Font mudguard stay for Early A7/M20/B31 brake
Post by: V500 on 09 Feb, 2025, 12:39
Those two twins are the earlier long-stroke model, and judging by the number plate, are 1947. BSA changed quite a few things when the later models came out.
I have a 1951 ST and a 1951 ZB32 Goldie and both have the stays mounted to fore and aft lugs on the sliders, not as in the pics.
Title: Re: Font mudguard stay for Early A7/M20/B31 brake
Post by: watts on 10 Feb, 2025, 00:14
Hello V500

There was some variation but this type I have was fitted between 1947-55 and A/B/M models but probably not all.  My problem is trying to identify the part number for the front and middle stay.

Thanks
Title: Re: Font mudguard stay for Early A7/M20/B31 brake
Post by: V500 on 10 Feb, 2025, 09:06
Even if you did find out the part no's I suspect that you'd be incredibly lucky to actually find some. Maybe try making them?
Title: Re: Font mudguard stay for Early A7/M20/B31 brake
Post by: watts on 10 Feb, 2025, 12:08
Hello

I have part numbers now, but as you say Im sure I will not find them,

Alternatively change the for leg bottoms, brake plate and axel!

I suspect later fork bottoms and 7" brake should be compatible.

Thanks
Matthew
Title: Re: Font mudguard stay for Early A7/M20/B31 brake
Post by: V500 on 10 Feb, 2025, 12:39
I would think the brake plate etc would be fine, just change the fork bottoms.
Title: Re: Font mudguard stay for Early A7/M20/B31 brake
Post by: watts on 13 Feb, 2025, 22:20
Thank you
Matthew