Another parcel came today, new swing arm bushes in bronze as opposed to the plastic rubbish Yamaha put in.
I've had these before for the xs400 restoration bike, i know when fitted they will need reaming as the fitment will slightly closes up the internal diameter.
Every one's different, so you never know it might not need anything doing.
The bronze bushes have an internal spiral to promote the distribution of the grease throughout the pivot. Talking of pivot bushes, these usually need looking at/need replacing as they can pit if neglected by infrequent greasing!