An XR failed
Never heard of such a thing.
look at what we do to those poor bikes and the state they are in, yet never lost one in ten years in fact the one I have in that little blue #87 Blue NSR which won the the Endurance is a 2001 motor. The oldest motor in our club and has never missed an event since 2001 and still has yet to even have a valve inspection.
Sorry to hear your misfortune
Hope to see you and Zak this weekend.