Quite a few builders have reworked the Harley Davidson Sportster into some form of XR750 look alike, this impressive piece, called the XRTT 1750, was built by American Motorcycle Parts. Starting life as a Sportster, the style is reminiscent of Cal Rayborn's XR750, but it has an advantage over those originals with an extra 1000cc in the S&S V-Twin, coming in at 1750cc, 100 cubic inches developing 100 horsepower.
Where many builders create a more upright riding position, this bike keeps close to its racer roots and looks all business. The photos don't show them, but it also comes with the fairings necessary to complete the XRTT look.
The 1991 Sportster frame was sand blasted and powder coated before the build began. The parts list is long, far too much to list here, but it comes together in a gorgeous bike that hits all the right style buttons and even with the S&S 1750, it still manages to come in at 450 pounds.
According to the AMCP website, the current owner is Reeves Callaway, the Corvette builder, and he's asking $25,000. Considering there's over $28K in parts alone, this could be a pretty sweet deal.
Link: XRTT 1750