The 2019 Yamaha YZF-R6 is a middleweight sportbike powered by a 599cc liquid-cooled, DOHC, inline four-cylinder engine with a 13.1:1 compression ratio and a 16,000 rpm redline. It puts out roughly 116 horsepower at 14,500 rpm and 45.5 lb-ft of torque at 10,500 rpm.