Thanks AVB
You were right the flywheel key was sheared off. A little bit left on the end so it appeared OK. I remember it being particularly difficult to get in, in the first place so that should have been a clue to check it more carefully when I discovered the odd positioning of the magneto magnets to TDC.
The compression readings were 75 dry and 77 with the oil. I may not have put enough oil (probably less then a teaspoon) in to get a correct wet reading, but I will concentrate on getting the timing right and see if that creates any more encouraging sounds.
I will not be able to sort anything for a day or so but should have an update for you Wednesday or Thursday your time.
