Eees a seemple says Manuel
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A old guy I know owned a Vincent Comet and Moggy 1000 Traveller from new in the mid 50's. He changed the oil in both machines religiously, probably sooner than required and he used both as his regular transport until 2010. The Mog had done 300k and never had the engine rebuilt so he stripped it and took the crank to Alex Carrs in Hull (Orcadian will know them
) and they told him that the crank was still in tolerance.
I think it's all about oil changes and probably the luck of the draw with many old Brit engines.
Trigs right, download the manual from the Dropbox links and read several times and it all makes sense in the end. Getting Black & Blue mains shells for the 400 is another matter as they are rocking horse poo.