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Re: Bsa M20 Carburettor

Hi John
I’ll try get the photos I have of this carb loaded here so you can perhaps make a call on what I have

Hoping my friend can use it on his June 39 K m20/21
Br
John

email (option): jonnyob1@googlemail.com

Re: Bsa M20 Carburettor

John has forwarded me some photos. It looks as if it has been boiled for half a century in a mixture of Castrol 'R' and Lynklife !

The body is clearly stamped 276/014R

380096039-1444924023031833-5947603192094748947-n

It has the gusset under the inlet, and clearly the four radial drillings for use with a Type 76 jet block.

380362342-879897307027026-5458234684377993922-n

but, and this is probably the crux of the matter, it is bored via the inlet for use with the /R suffix jet block. To my mind, this can only be an owner-modified 276.

380382574-672715351493665-922643199377364591-n

Incidentally, despite what Amal published after the war, the Norton WD16H was being fitted with a 276/011 carb as early as December 1936. This was with the Norton type jet block though, and not the /R type.

Re: Bsa M20 Carburettor

Thanks Rik
Once we get it apart here - we can check the block for type fitted -
Found out some new info again - which is always good

Br
Jo’b

email (option): jonnyob1@googlemail.com

Re: Bsa M20 Carburettor

Yes it is a 276 that has been modified by having the four holes drilled probably to suit the 4 hole jetblock that was laying in his shed/barn.

Re: Bsa M20 Carburettor

Agree with John Parker, Body Stamping looks original and it has the large air passage hole in the inlet track as a 276. The 4 holes are drilled for a type 6 jet block and as a later 276 block is fitted the body holes will be blocked off with the 276 jet block so the carb would function ok.

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