Are both outer bearings on a WM20 crankshaft readily available from a bearing shop? If so what are the bearing numbers I require please. My parts book lists them as 65-2045 & 27-261
Those are the BSA part numbers. There are four main bearings in an M20. The numbers are listed in the technical section. http://www.wdbsa.nl/Bearings.htm
Darren Wrudd from this forum should be able to supply them darren@john-fenwick.co.uk