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61
British Bikes / Re: What is this BSA Frame??
« Last post by cardan on July 28, 2025, 11:51:13 PM »
Hi Pete,

What a ripper! The main frame is certainly BSA, very likely from a vertical-engined model with the oil in a "sump" out the front, early-mid 1930s. The best plan is to decipher the frame number - on the forged steel backbone somewhere - then have a look at a list of BSA frame numbers to see what comes up. https://www.bsa1930s.nl/engine-and-frame-numbers/

The rest of the bike has been "added" to the older part of the frame. Worth leaving as an interesting mix.

Cheers

Leon

[Ed: took me a couple of goes to spell decipher!]
62
British Bikes / Re: What is this BSA Frame??
« Last post by R on July 28, 2025, 11:23:29 PM »
1920s BSA's had an I-section backbone, but I'm not sure if it was like that.
Something about Francis Barnett's "built like a bridge" comes to mind also,
with all those bolted joints ?
63
British Bikes / Re: What is this BSA Frame??
« Last post by Rex on July 28, 2025, 03:47:47 PM »
The rear plunger section is likely from an A series or B series BSA, but as for the rest?
64
British Bikes / What is this BSA Frame??
« Last post by peteR on July 28, 2025, 11:29:05 AM »
Can anyone shed any light on what this frame is?

The engine is a 1952 M21 that has some AA history. I can see that someone has fitted bantam forks to it, but I dont recognise the frame at all.

The frame number is not legible.

The engine is not a good fit into the frame, but am trying to assist my friend identify what he actually has.

If you need any more pictures or info, please let me know.

Cheers
65
British Bikes / Re: AJS 16M 1951
« Last post by john.k on July 26, 2025, 05:50:47 AM »
Pull the gearbox to bits .....the whole joy of old bikes is pulling them to bits and putting them back together again.
66
British Bikes / Re: AJS 16M 1951
« Last post by R on July 26, 2025, 03:57:02 AM »
We are assuming there is nothing untoward going on here,
like a case full of broken teeth jamming up the works. !
Without a full inspection, its a bit of a lottery if this will be good.

Draining the oil and inspecting what comes out is a useful diagnostic tool.
If its nice and clean (and new) it can go back in ?

67
British Bikes / Re: AJS 16M 1951
« Last post by chaterlea25 on July 26, 2025, 12:52:32 AM »
Hi All
When the outer cover is taken off the indent plunger and spring behind the selector drum pushes the drum outwards so partially engaging a gear inside the box hence the clicking !! It will be ok when the cover is put back on..
Make sure the ratchet gear on the gearbox shaft is working correctly and not worn out or broken.

John

68
British Bikes / Re: AJS 16M 1951
« Last post by R on July 26, 2025, 12:01:48 AM »
Can you turn the box over at this point, using the back wheel.

The leading 2 teeth on that quadrant are not ground down at all.
This gives a rather brutal initial engagement, and they can jam.
Ground down a bit, they lead into the others, and swing into action. !

If that were mine, I'd get out the angle grinder with a thin blade,
and shave a bit off the 1st 2 teeth.  Keep the same basic tooth shape,
just shaved a bit, and no sharp edges left.  Easy does it....

69
British Bikes / Re: AJS 16M 1951
« Last post by dynamic on July 25, 2025, 10:42:24 AM »
here are more photos dident load with previous post

PS. kickstart still solid .
70
British Bikes / Re: AJS 16M 1951
« Last post by R on July 25, 2025, 08:48:54 AM »
So can you now kickstart it OK ?

Is that a fast click click, or slow
The chain contacting something could be a slow click,
but a fast one needs further investigation.
Even the tyre contacting something

Don't recall, is this bike new to you.
Some fettling is to be expected....

P.S That box is later than the CP expected for 1951 ?
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