I own a 1936 Bsa R4 , pics of which can be seen on the Bsa WDM20 Dutch website.
I am about to purchase another very rough model which will need a lot of work. the engine is minus its head barrel and piston and has suffered because of this.
Also the gearbox is missing its outer cover and again, weather has taken its toll.
It does come with a smaller 250cc engine which I intend to fit unless I can find the missing parts for the bigger engine.
I intend to build this bike in the style of an R19.
All advice gratefully received.