I have a 2005 R3. The driveshaft spline failed at 22K miles. Triumph agreed to replace the part, I paid for labor. My dealer at the time stated that Kawasaki and Yamaha used the same driveshaft and their specs called for it to be lubricated at the service intervals while Triumph had no such spec. They were perplexed by that. My dealer started lubing the spline at every service interval. The bike now has 40k miles on it and the replacement spline is 50% worn, in spite of being lubed every 10K miles. The dealer now wants to lube it every 5,000 miles, at my expense of course.
Something is obviously defective in the original manufacture, however Triumph will not do anything as they say the issue occurred out of warranty. I tried to use the logic as was used by a poster here that the spline had to be wearing during the warranty period and was only discovered out of the warranty period and there was no way of knowing of the problem during the warranty period, but they would not hear of it. I also brought up the fact that an implied warranty might be in force here, and, to my disbelief, they stated that "since you drove the product as a motorcycle for eight years, we have fulfilled any obligation under an implied warranty." What did they think I was going to drive it as- a submarine?
In all they displayed a very arrogant attitude in my phone conversations and correspondence with them. I am disgusted with them and have lost all respect for the company.
What I am going to do is buy another shaft, have a friend who is a bike mechanic install it and then lube it myself every 5,000 mi. Another R3 forum has directions for doing that. I will not deal directly with Triumph any more.