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Compact, Lightweight in-line
4-cylinder design is quiet, clean-burning and fuel efficient – with
power to spare.
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16-Valve Double Overhead Cam. Four
valves per cylinder for increased air supply and volumetric efficiency,
increasing power and performance. |
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Electronic Fuel Injection is
controlled by the ECM (Engine Control Module). The fuel/air mix is
matched to engine load and speed for maximum performance and fuel
efficiency. |
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Twin Counter Balancer Shafts
minimize engine vibration for a smooth, pleasant boating experience. |
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10mm Offset Crankshaft allows for a
larger intake volume design. Four tuned intake tubes boost torque in low
and mid speed ranges for quick acceleration. |
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Composite Intake Manifold
- The long tube intake tracks are tuned to increase air flow increasing
low end and midrange torque performance resulting in a more powerful
hole shot and increased acceleration. The air silencer box reduces
intake air noise while the surge tank reduces air turbulence for
smoother operation. |
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The Microcomputer
Ignition, adjusts timing to maintain optimum engine performance,
economy and durability under all conditions. |
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The New, Multi-Function Tiller
Handle, optional on F25 - F115, puts easy control at your fingertips
in a sleek, ergonomic new design – including Yamaha’s exclusive,
variable trolling speed feature. (F50 through F90).
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Yamaha's Award-Winning Innovation continues
to revolutionize four stroke technology. |
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Yamaha's Celebrated ACP-221 Paint Process
provides a tough, 5-layer barrier against corrosion. |
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Yamaha Four Strokes blend fuel economy with
power and performance from 2.5 hp all the way to the 250 V6.
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Every Yamaha Four Stroke is
protected by our 3-Year Limited Warranty. |
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Yamaha's Four Strokes Exceed
Federal EPA 2006 emission requirements and the F50 - F250 have earned a
California C.A.R.B. three-star rating for ultra-low emissions, or a
two-star for very low emissions. |
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Extended Trim range delivers
better acceleration to plane and top end speed. The tilt range is a full
70° for tilting the engine above the waterline. |
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Freshwater Flush Device enables
you to flush the engine, while running or not, for added convenience. |
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Yamaha is Dedicated to Helping
create a cleaner environment through advances in outboard technology. |
