great question but our bikes break down in hundred dollar pieces or more kind of a slow death.
perhaps you could ask at how many miles was the top end rebuilt, cam tensioner replaced etc
I have the 103 in my 2003 flhrsei2 with 26k miles and running strong

- I put in the Updated Billet CAM Plate with Hyrdaulic Tensioners and Larger Oil Pump and New CAM Bearings at 24,000.
The OEM CAM Tensioners didn't look bad, but I figured one less thing to be concerned about for some time.
At 24K the Compensator Nut loosen a wee bit, just enough to chew up the Cover Apparently the early 2003 FLHRSEI2's had a different TQ Spec# tahn the later ones.
I have 40,000 on my 2003 FLHRSEI2 now and Zero issues since the Compensator Nut Issue.
In Fact it runs so well that I am very leary about booting up the TQ and HP for fear it will Not run as smooth.
I have been told by Local Wrench that 100,000 is not far fetched with proper Maintenance.

- As far as the Riders Go - Tim Allen in his Michigan Adds gives up roughly 25,000 Mornings (68.5 yrs).