I posted this question awhile back on another BMW forum. I want to offer participants the following short You Tube video from Chris Harris, owner of Affordable Beemer Services in Manchester, NH. in order to solicit reactions.
Chris has my 2004 R1150 RT and will be installing a modified (non OEM) clutch plate, machined by Bruno Sax in Canada. The bike has 15 K, and exhibits no current transmission input spline - clutch plate issues. The tape speaks for Chris' perspectives on past BMW design and production problems, and their unwillingness to remediate them. The other design issues Chris has with many Oil Heads - not covered in his video - are Final Drive and servo-assisted brake problems.
The fact that Chris has my bike for an expensive repair attests to my own belief in his judgement and mechanical work, and my wish not to experience a subsequent mechanical failure while touring that I would prefer to have addressed beforehand: