George,
From your photo the charging set looks like a post war BSA 300 watt, they were either 15 or 30 volts, (marked on the plate). I repaired a good number of these in REME workshops and from memory there was no silencer, just a flexy pipe about 5 or 6 foot long. ( I can recall the pipe coiled up and strapped to the frame)
It was fitted to the engine by a sleeve on the pipe slipping over the end of the exhaust and a large split pin on a chain secured it through a hole in sleeve and exhaust manifold stub.
To be correct, the name Chorehorse applied to the Canadian sets built by OMC during WW2.
Richard
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