"Check the wheel bearing seals for rust or corrosion," Barsi says, "and let the bike run and listen for suspicious noises. And I'd be leery of a bike with more [mods] than an aftermarket carburetor and exhaust system." There were a lot of add-ons for the Dyna that didn't fit so well, especially in the exhaust department. Barsi also suggests a close look at the Dyna's rubber engine mounts, especially on high-mileage examples. As with most used bikes, a clean, stock example is best. We're disappointed to see the FXDX cut from Harley's '06 lineup, but if you're after a Big Twin that's at least as much fun to ride as it is to look at, this is the one.