Yamaha Marine F70 The Yamaha 70 hp, 60 hp and 50 hp Midrange four strokes are the go-to outboards for family, fishing and fun. Light and powerful, they sport 1-liter displacement, single-overhead-camshaft designs and electronic fuel injection. They deliver quick starts, high performance and incredible efficiency for aluminum fishing boats, pontoons and fiberglass boats. They also offer incredible trolling flexibility with Yamahas exclusive Variable Trolling RPM Switch. Available on the F70, F60 and F50, this allows anglers to adjust trolling speeds in 50-RPM increments. The Yamaha Midrange 70-, 60- and 50-hp four strokes. Solid choices for any boater. Our 1-liter 70-hp midrange features a two-piece upper case and 10 percent lighter pistons. Its up to 80 pounds lighter than other four-stroke competitors and the class-leader in power-to-weight. Combined with its 16-valve SOHC design and 17 percent larger intakes, and its one of the most responsive outboards on the water.