Had bad slippage from my clutch (2005 KS), and I replaced the pack with the Barnet pack without issues. Stopped the slippage. According to our local dealer, the issue is the same known for these bikes with not enough oil getting to the clutch. The clutch dirt and debris then mixes with the oil to causes a paste and causes them to slip. In the past using the lighter weight synthetic oil recommended by BMW helped as much as the fixes to replace the oil nozzle and the oil pump sprocket...I guess it was able to wash away the debris, of which there was a lot when I opened up my clutch. I have the new oil valve/spiget/button thing but haven't replaced it yet, and dont have the new sprocket yet, but will try.
My issue, which doesn't seem to be addressed elsewhere is with the funny rumbling noise that occurs during idling in neutral, which goes away if you disengage the clutch It is not the startup rattle (timing chain tensioner problem), nor the judder problem. And coming to think of it, it doesnt really fit with an oiling of the clutch problem, because in neutral the clutch isn't released...it is engaged, which means it is a noise coming from the rotation of the shaft in the transmission in the neutral position. I am wondering if has something to do with the oil pump drive behind the clutch, because it doesn't seem to fit with something in the transmission..noise there seems like it would be due to a missed neutral, and maybe be seen by some movement of the rear wheel or something (speaking out of my butt here, bc I don't really know how the neutral works).
I worry that it portends failure in the transmission, but am hopeful that it has something to do with the oil pump chain or pump itself, which is not as ominous to me).