Well, I currently have my 2000 LT torn down for a clutch job due to a leaking rear oil seal. (60K on the bike) I have not removed the trans yet, ran out of time for today. As I removed the swing arm and the drive shaft I noticed some strange wear on the shaft. It looks as though it was wearing on the side of the swing arm. However, there has been no noise and no vibrations. Also, when I pulled everything apart it came apart rather easy.
So, I am wondering if the final drive failed in the past causing the pinion to kick to the side and push the drive shaft into the swing arm. Then the final drive was rebuilt and there was no reason to replace the drive shaft for just some wear marks.
Here is the drive shaft:
Current state of the bike, I did remove the tank and replace the air and fuel filter as well as the fuel lines, but put it back on for now.
So do you think I am right? I would think if the shaft was still hitting the swing arm I would be hearing loud noises, vibrations and also seeing filings, but there is none. Its as if someone cleaned it out already. Also, no issues with the final drive, no chunks and normal looking oil.
And before anyone asks or says, yes, I have a Viton O-ring, and all the mandatory parts from BMW for the cluch job, plus the rear main seal.