I am wondering what you would consider "failed"?
I have an 08 Springer that I considered suspect at 7,000 miles due to oil consumption. See my thread "DISGUSTED". below.
The MoCo replaced this motor at 30,000 miles. It drank oil like nothing I have ever seen. By the time they finally gave in and changed it I suspect the flywheels had shifted and/or the crank had issues. They sent it to the factory and will not tell anyone what the problem was. However, if I could keep oil in it it still performed very well as far as full on power was concerned. I tried and failed at several attempts to make it completely scatter! One instance, 12+ miles at 5400 rpm in second gear!
Since the MoCo gave me a new motor, I guess you could consider the old one a "failure".