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Bsa m20 horn mounting change date

Hi
Do we have any information on the date when the horn located under the seat was relocated to the more commonly seen front mounted location

Br
Jo’b

email (option): jonnyob1@googlemail.com

Re: Bsa m20 horn mounting change date

Hi John

Its in the DME circulars under the medium "When Necessary" section

B.390 20/1/43 Horn - Revised design & location. B.S.A. M/C.

Presumably alterations to existing machines would have happened at roughly the same time as changes in the factory.

Rob

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

Re: Bsa m20 horn mounting change date

Its one of very few which I have seen copies off, wish I could find more. And interestingly it seems to show a drawing of a WB30.

Rob

DME-B390-BSA-1

DME-B390-BSA-2

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

Re: Bsa m20 horn mounting change date

Thanks rob
It seems then that up to 1942 the horn was under the seat

Yes it looks like a wb30 engine plate but the horn bracket shown in the illustration appears to be a different type too to that of an m20

Br
Jo’b

email (option): jonnyob1@googlemail.com

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