finally got the K1 back together. Rocker cover on, new seals in the oil pump, engine in, hooked up, oil and hey presto it worked. It was warm, 36 degrees C so the oil was already warm when I put it in. On start up, 65 psi and after 15 mins 12 psi. I did remove the shims in the relief valve as I don't race the bike. Happy now it's back on the road, no oil leaks...