The 4-stroke outboards
New graphics symbolize Yamaha's cutting-edge innovation, reliability and durability
Yamaha 4-stroke outboard development,a history of technological innovation and environmental measures
Surprising the world with Yamaha's bighorsepower 4-stroke outboard technology
Amid the development of increasingly large 4-stroke outboards, the epochmaking model that completely changed the image of what a big-horsepower 4-stroke outboard could be was the F225A, which at its release had the largest horsepower of any production 4-stroke outboard in the world.
In the outboard motor industry at that time, it was generally accepted knowledge that it would be very difficult to build a viable 4-stroke outboard motor of over 200 horsepower. Yamaha engineers refused to accept that assumption, however. At the time of its release, the F225A featured a number of innovative technologies and revolutionary designs, including an exclusive combustion chamber design that enabled higher power output with a smaller displacement, a 60-degree V angle and internal injectors, plus a new engine layout with what came to be called the "In-bank Exhaust System" that positioned the exhaust system inside the V bank of the cylinders for greater compactness.
With this, Yamaha became the first 4-stroke outboard motor maker to try an engine layout that ran the exhaust pipes through the V bank and moved the intake system outside the block. Furthermore, by reducing the size and weight of many parts, changing the layout and using innovative new ideas and technologies throughout the engine, Yamaha succeeded in creating a 4-stroke outboard motor with higher output in a smaller package than anyone had thought possible before.
With ongoing efforts to apply new technologies in innovative designs, Yamaha succeeded in building a lineup of 4-stroke outboard motors ranging in size from 2.5 to 350 horsepower.
Then, in the autumn of 2010, Yamaha introduced its new V6/4.2 liter series. Once again, these models achieved extraordinary levels of weight reduction with new features like sleeveless cylinders made through new plasma fusion technology, all of which allowed Yamaha to build 4-stroke outboards with comparable weight to 2-strokes.
The lineups of outboard models offered differ by country or area. Product names, coloring and graphics may also differ. The specifications of outboards shown on this website may be changed or production discontinued without notice.
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Direct inquiries concerning Yamaha outboards to your country's distributor or local dealership..