I have about 65,000 miles on my 2014 Super Tenere. At 32,000 miles, I went thru my bike because I went to Inuvik, Canada with a fair amount of mud and wanted to be sure all was good. I saw some oil in the area when I pulled the rear end off. I saw the seal cut thru the Coupling, Gear 23P-46123-00-00 so I bought a new one (seal looked good) and replaced. I put a lot of silicone grease when assembling. Now at 65,000 miles (33,000 on coupler) I again took it apart and saw a cut mark on the coupler and the seal was still looking perfect. I decided it was time to machine it down and change the material the seal rides on. The seal surface was 50.0MM dia. I turned it down to 48MM, turned a sleeve made from 17-4SS and pressed it on with .0025" press fit. I left the OD a bit big, indicated on the center spline to be running to .002" TIR and turned the OD to 50.00MM. Will see how it looks after another 30,000 miles. I'm still taking everything apart but everything else looks perfect. Hopefully this fix will allow me to go another 100,000 without touching it. Here is the part I'm taking about: Here is the coupler with notch. Notch was .008" deep. I turned it down to 48MM dia. Here it is before pressing the ring on. With the ring pressed on And finished to 50MM with chamfer.