If there were a Hall of Fame for motorcycle engines, Honda's six-cylinder CBX masterpiece would be inducted by unanimous vote. Ties to the company's wailing, 20,000-rpm Grand Prix 250cc six were more than mere coincidence: Both motors were penned by the brilliant young engineer Shoichiro Irimajiri. In 1979, a 100-horsepower, 1047cc, double-overhead-camshaft motor with 24 valves and six cylinders all in a row was mind-blowing stuff. That it was only a couple of inches wider than the CB750 inline-four was even more amazing. Within a couple of years Honda retailored the CBX into a refined sport-tourer with the addition of a fairing and aerodynamic panniers. A beefier frame, aluminum single-shock swingarm, wider rear tire and fortified brakes firmed up the CBX's underpinnings. This last-year CBX shows less than 5000 miles on its odometer.