Harley Davidson XR/TT 750
Earl Widman. Harley-Davidson's St. Louis dealer,
assembled this particular motorcycle. He modified a Lowboy KR frame to
accommodate the 748cc overhead-valve twin XR engine and four-speed
transmission. Widman's son, Ron, raced this motorcycle during the early
Sometime later, Widman sold the motorcycle to
George Schott. the Harley-Davidson dealer in Lewiston. Maine, who competed
on it as a drag racer. Eventually, Dan Caulkins of Decatur. Illinois,
acquired the bike from Schott, installed a Sportster engine in it. and used
it on the street. Finally, he put a correct XR engine in and restored it to
the same condition and appearance as when Ron Widman used it in competition.
The Model XRTT-750 Road Racers had aluminum oil tanks, staggered dual
exhausts. Smiths tachometers, four leading-shoe front brakes, and rear disc
brakes. They raced on aluminum rims with 3x18 front and 3.5x18 rear tires.
The racing department gave these machines oversized 6-gallon fiberglass gas
tanks, enabling them to compete in the grueling Daytona 200-mile race with
fewer pit stops for refueling. Much attention was paid to shielding the
rider's left leg from extreme heat when tucked in.