Your Long term trouble free drive shafts is exactly what I would expect to experience Spline failure seems to me to be an anomaly perhaps a result of too much force for the spline engagement on a particular bike. I would think changing the suspension if it results in less engagement of the splines coupled with a significant increase in power or excessive load would be those things that could cause splines to be ground off with only a 1/2 inch of engagement possible lowering the bike with a modified suspension causing it to squat is likely a major component of shaft failure. Friction doesn't seem to be a problem with a spline engagement there is very little movement hence very little friction although corrosion due to a lack of grease is of course a possible cause but excessive force due to a lack of normal spline engagement is too me the most likely culprit.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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I have an '06 C50 with very low miles (5K). I recently had new tires put on just because of age, not wear. I had the shop check the splines for lube. They said it looked fine, but they did add a bit & put it back together. I felt better.
That's what they did, checked where drive shaft goes into the drive.They done nothing for you for this problem. For this problem, you have to physically remove the drive and shaft, and then separate them, that is where the failure occurs. It is the splines at the end of the driveshaft where it connects to the final drive that must be lubed to fix this issue.
Sorry but unless they also pulled and replaced the seal on the end of the shaft and lubed there they didn't do the whole job and the most critical place for failures. You need to search here a little more and then contact them to see how far they went.
Hmmmm.......I'm not having any problem understanding what they did to your bike. "...where the drive shaft goes into the drive...". That is exactly the end of the drive shaft that fails. That failure is almost always associated with a rust colored fine powder. That is all that is left of splines that have been destroyed by corrosion.