This season I decided to return the Honda to its previous owner and resurrect my 1981 BMW R100 which has been stored in my garage and last licensed on the road in 2002. At that time I'd been riding it for a few years when I bought my second BMW, a 1976 R90/6. The R90 became my daily rider (weather permitting) for the next 11 years. 

The previous owner of the Honda was my brother in law who was too busy with his work to bother with it, so he sold it to me. but now that he is retiring, it's going back to him, and I'm left with just one bike, my first BMW, the blue R100.

As I remember, the R90 became my ride because once when I was retorquing the heads on the R100, I stripped the cylinder stud in the crank case. I needed time to get my head around drilling into the engine case in order to install a helicoil, so I switched over to riding the recently acquired R90. With a bike to ride, I postponed fixing the R100 for many years. I was intimidated by the necessary repair, knowing that if was messed up, the motor would become a boat anchor. 

A few years back, the repair was made, but I was still riding the R90, and then I got the Honda which was a lot more fun to ride after many years on a BMW. I worked on the R100 after the cylinder stud repair, cleaning it up and removing some emissions recirculating plumbing. After cleaning and (overly) relubing the rear wheel drive splines, I damaged the rear drive large seal when reinstalling the wheel. Excess grease caused the seal to leak, and the oil in the rear drive exited onto the brake shoes and onto the floor. That happened just before my trip. This spring, having sold the R90 and deciding to return the Honda, I turned my attention back to the R100.

I've removed the rear drive from the drive shaft and removed the damaged seal. I am currently waiting on the mail for the new seal. I was hoping it would actually come today, but no luck. Below are some pics of the process.