http://www.hondanews.com/CatID7102?mid=2004022043998&mime=asc CBR1000RR Development] article from hondanews.com The compact 998 cc in-line four was a new design, with different bore and stroke dimensions, race-inspired cassette-type six-speed gearbox, all-new ECU-controlled ram-air system, dual-stage fuel injection, and center-up exhaust with a new computer-controlled butterfly valve.