I suspect the final drive seals are leaking, and this bike has been sitting for about 25 years. So I am rebuilding and refinishing the rear drive. I have never rebuilt a rear drive before and I understand this requires some special tools and also correct shimming of the pinion and crown gear; aka, ring gear. So I asked Matt Iles, owner of Iles Motorsports, if I could watch him do this work, and he agreed. I have Matt replace all the seals and bearings in the final drive so it will be good for another 40 years and 100,000 miles. π That way I get an education about how this is done so I can decide if I am capable of doing this work in the future. Any mistakes in this documentation are on me, not Matt.
Here is the link to my documentation of Matt’s work.
Here are some before and after pictures.
Original Rear Drive Before Removal From Swing Arm
Rear Drive Case Before Vapor Blasting
Vapor Blasted, Rebuilt Rear Drive
Vapor Blasted, Rebuilt Rear Drive
Vapor Blasted, Rebuilt Rear Drive