Thanks unfortunately the new units i have discovered don't have the spring that pushes the plate out its done by an o ring apply friction to the plate.
O well that sorted and spark plug gap reduced from 1mm to something more sensible it ran for 20min and then conked out. So I will be taking the oil pump to pieces tomorrow. And sealing the exhaust system up properly.
I bloody hate 2 strokes. Temperamental
of devices unless it a big diesel 2 stroke