I have stripped clutch side of motor. Clutch completely out, Gear cluster on crank are taken off.
Balance shaft turns freely. But crank is still only turning between the 2 points. Nothing else is connected to the crank in the engine casing.
The head and barrel is still on but I've had that off and all is fine there.There is no visual evidence of bearing problems.

Suppose next job is to drop engine again and split the crank casing.