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The 4-stroke outboards

Yamaha 4-stroke outboards packed with years of technological innovations

Get to know Yamaha's
4-stroke outboards

New graphics symbolize Yamaha's cutting-edge innovation, reliability and durability

Since the launch of the first Yamaha 4-stroke outboard motor in 1984, the lineup has been expanded to now include models ranging from 2.5 to 350 horsepower. What's more, when you include detail spec variations on these models in areas like transom length, tiller handles, remote control units, starting systems, etc., to fit specific uses or use environments and different types of boats, Yamaha offers the industry's largest number of variations, at more than 180. It is also important to note that Yamaha also offers models specifically for commercial use in the 20 to 200 horsepower range.
Yamaha 4-stroke outboard motors are designed and engineered with the same dedication to durability, reliability, light weight and compactness that Yamaha 2-strokes have long been famous for. Another thing that sets our 4-stroke outboards apart is the high level of environmental performance Yamaha engineering has achieved by developing on the inherent 4-stroke strengths of cleaner running performance and quietness and taking them to new levels.
Of course, these 4-stroke models feature the latest in Yamaha exclusively developed technologies like Variable Camshaft Timing (VCT), long intake manifold designs, the Blow-By Gas Re-burning System, the Yamaha Diagnostic System (YDIS) and variable trolling rpm control. With the latest V6/4.2 liter series models, you will also see big advances in weight reduction compared to our previous big horsepower models. This kind of advanced Yamaha engineering was officially recognized when the F250C model of the VMAX SHO series for bass boats, released just before the new V6s, received the coveted Innovation Award from the US's National Marine Manufacturers Association in 2010.
For 2011, Yamaha rolled out new graphics for all of its 4-stroke series models.
Models with these new graphics will surely spread worldwide as symbols of the high performance, outstanding reliability and durability and ecofriendliness of Yamaha 4-strokes.

Yamaha 4-stroke outboard development,a history of technological innovation and environmental measures

Born in 1984 - the first Yamaha 4-stroke outboard motor

After winning a strong reputation as a builder of reliable 2-stroke outboard motors, Yamaha outboards began to win recognition as one of the world's leading brands thanks to the quality of its technological innovations to make engine performance more eco-friendly. During the 1990s, developed nations led the way in introducing regulations to limit the environmental impact of products, as exemplified by the emissions regulations adopted in the USA. This forced the outboard motor makers to direct their development efforts toward more eco-friendly engine technologies.
Prior to this trend, Yamaha had already developed and marketed its first 4-stroke outboard motor, the F9.9A, in Europe in 1984. With subsequent development, the F9.9 became the first outboard to clear the strict environmental regulations implemented in 1992 for boat engines used on Bodensee, the lake on the borders of Germany, Austria and Switzerland.
Another big advancement came in 1998 with the release of the 4-stroke model F100A powered by a DOHC 16-valve, in-line 4-cylinder engine that gave it the highest power output and best environmental performance in its class. Coming in a number of variations for specs like transom length and propeller type, this model made it possible to outfit a wide variety of different boat types around the world with 4-stroke engines. This F100A model opened the way to the development of increasingly larger horsepower 4-strokes and eventually the F350 that now tops the lineup as the flagship of Yamaha's 4-stroke outboard motors.

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.
Always read your owner's manual before using the outboard and be sure to use it properly.
Direct inquiries concerning Yamaha outboards to your country's distributor or local dealership..

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