2012 Yamaha YZF-R6, 2012 Yamaha YZF-R6 The YZF-R6 is the ultimate racing bike, designed to get you around the track in minimal time with features unique to no other bike. Ultra-compact, lightweight, short stroke, 599cc, DOHC, 16-valve, liquid-cooled, in-line four-cylinder with lightweight titanium valves produces incredible horsepower. Redline is set at an amazing 16,000rpm. 67mm bore and 42.5mm stroke provide a fast revving powerplant. Engine width is minimized thanks to Yamaha s special casting technologies and liner less cylinder design.