Actually, two red, that little bit of spline grease, along with checking rubber boots and exact fluid levels in the final drive will result in a final drive that should last darn near forever. I have a lot of experience with shaft drive bikes with well over 100000 miles (i've owned 3 bikes that clocked over 100000 in my care, two of them are still on the road and one is permanently attached to a toyota
If its lubed, and it is aligned properly and doesnt come apart early, there is a chance it should literally last longer than any moving part on the bike. You are correct in assuming the vol is a value machine, but shaft drives last forever and a day.
My last old school beemer was pulling a sidecar. I decided to completely strip the final drive to look for signs of excessive gear wear. My tech, the best in the US, looked at me like i was crazy and told me that if it wasnt broken at 75k, it would probably last indefinitely.
So, you can see why us shaft drive fans are so anal about using a great moly paste lube and ensuring we generously and properly grease the splines. Done so, just a few times in a lifetime, will keep the part working indefinitely.
On my paris dakar, the driveshaft was pulled and lubed at 40,000 miles, then not touched again until 150000 miles, then never again. You can see how just making sure the grease is done it will work a long time.
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