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The WD Motorcycle forum
I've come across these multitude of similar but different BSA chaincases in the past. I've got this pair of heavily painted cases that came with my B30 project and I'd like to check them out before I spend too much time on them. Can anyone give me a clue where to look for the part numbers? So far I haven't seen anywhere to start looking.:mag_right: Any pictures of yours Danny? Ron
email (option): ronpier@talk21.com
PS I've found the number on the outer 66-7503 which seems to be the usual BSA way on being one number out (66-7502). I guess for a part before it is finished? Still looking for the inner number. Ron
Had a look at the ones put by for my GPO WM20 and WB30 and Ian is right its the rear chain guard mount which differs. Left marked 65-7578 Right 66-7602 Rob
email (option): robmiller11(a)yahoo.co.uk
66-7525 was the outer cover on 1940 M23 and 1939 M23 M24, how did it differ from 66-7502 M20 & M21? Is that the version with the shallow clutch dome? Rob