Forgot to say, these engines did originally have a stem “seal” but it’s not really worthy of the name. It’s a rubber washer (more like a tap washer!) that goes around the top of the valve stem and is somehow supposed to stop oil running down the stem and entering the guide.
BTW, The later B-series engine has valve stem seals but the stems are a different diameter to the 1200 engine. So no use.
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