Thanks Chris, first time stripping one of these ,I am treading carefully.
Grumpy has been a great help :-)
I have been soaking and working on the carby, the emulsifier is out after a soak in some cleaner, it is not the best, I think it may be OK, if not I can source another one.
I have some parts now, so I will start to reassemble this engine before my retention span fades.
The rings are marked (top STD, Y STD)
[Linked Image]

Happy is he who penetrates the mystery of things.