Yamaha’s next generation 115 four-stoke is the lightest in its class and sports increased power too. It tips the scales at 377 pounds, 24 pounds lighter than its predecessor, due to a composite lower pan and cowling, single ram trim and tilt, and a new mounting bracket. The new powerhead has increased bore and stroke for a displacement of 1.8 liters. The double-overhead-cam four-cylinder design has larger intake and exhaust valves for more power and better midrange torque. A knock sensor allows the engine to operate constantly at peak output, resulting in noticeable acceleration. The F115 is available in both left- and right-handed rotation for twin applications.