Gui.dorey wrote:If I do remove the timing chain, I’ll lose my valve timing, right? That was another nightmare I wanted to avoid. It took me ages to get it right...
Very true. Try a socket wrench on the dynamo and crankshaft nuts, just to be sure the dynamo is free - you will probably see the camshaft move a little bit too. You might want to slacken the cam chain tension, which will give you more movement.
I would have thought that there was enough clearance in the coupling gears for you to see one of the crankshafts move. I think you will be able to get some indication of where the problem is with the timing and primary covers off.