How did Yamaha create a 4.2 liter outboard that weighs less than or equal to two strokes of the same horsepower?
In short, a great deal of research and planning, combined with the innovative application of materials and technologies that have been proven in other industries, but are new to an outboard application. One example is “Plasma Fused Sleeveless Cylinders”, where we replace customary steel cylinder sleeves with a plasma fusion process. The resulting cylinder walls are 60% harder than steel. This not only saves weight, but also allows us to increase displacement, without enlarging the outer diameter of the cylinder. Of course, there are other weight-saving and power-enhancing features at work here, too. Suffice to say Yamaha engineers have realized previously unbelievable low weight and high displacement in a V6 four stroke outboard, which results in break-through four stroke performance.
