Well, I have opened her up and dismantled the bits and I can't seem to actually see anything wrong. When the tappets are worn are there any signs? They look just as good as the new one I bought except they are a little oil stained.
The crankshaft looks OK aswell, although I don't really know what is OK and what isn't, although there is nothing obvious at all. The rocker arms; well they look like rocker arms
I'm stuck!! What do I do next?

Woz