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63000 on a Street Bob and 31000 on the Sportster. Both of which have rubber mounted engines and still pulled fine. Keeping a good service routine is the key to long life with anything.
Around 20k after I did the 1250 conversion. Replaced it with the Energy One with stronger spring.
It was still working, rivets has not disintegrated, but it was not enough to hold the power of the 1250. When I pulled it the rivets were just barely starting to show signs of failure...and that was after riding it for a couple thousand miles with the 1250.
I started having trouble downshifting and finding neutral at 38,000. I installed the Barnett with the standard spring. I ride like a Granny so saw no reason for the heavier spring.
7 Surprising Harley-Davidson Products that Are Not Motorcycles
Slideshow: The bar-and-shield logo shows up on far more than motorcycles, some of the company's most unexpected products have nothing to do with riding.
Slideshow: From the troubled AMF years to modern misfires, these bikes earned reputations for reliability issues, questionable engineering, or disappointing performance.
Crazy Bunderbike Build Looks Amazing, But Is It Impossible to Ride?
Slideshow: The Swiss custom shop has taken a Harley Softail and stretched it into something so long and low that it looks closer to a rolling sculpture than a conventional motorcycle.
Engraved Rebellion: Inside Bundnerbike's Glam Rock II
Slideshow: A standard cruiser becomes an intricate metal canvas in the hands of a Swiss custom house known for pushing Harley-Davidson platforms far beyond their factory brief.
Slideshow: Harley-Davidson's challenges aren't abstract; they show up in dropping shipments, shrinking dealer traffic, and strategic decisions that aren't yet translating into growth.
