Oooh I've found some more engine reference numbers. They are very subtle and I have only just noticed them. They appear to be hand etched with a vibrating engraving tool. I have no idea of their significance (and in fact I'm not sure if I can read them completely) but I suspect they might be something to do with matching the engine case halves during manufacture.The numbers appear to be similar on both halves of the case and can be found on the bottom side of the cylinder barrel port.
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