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XTO Offshore V8 5.6L 425 HP
Yamaha’s high-powered portables are redefining the expectations for portable horsepower, from the F15 to the all-new F20 built on the same outstanding platform as the F25, a 2017 IBEX Innovation Award Winner. Their single-overhead-camshaft, two-cylinder designs create power to weight that’s not only eye-opening—but in the case of the F25, it’s also class-leading and category jumping.
Make an appointment with Tom Ross to come in and see this motor in person.
Efficient Power
The F25, F20 and F15 all feature a two-valve-per-cylinder, single-overhead-camshaft design that provides better breathing and more power.
Optimum Performance
An optimally balanced crankshaft and labyrinth exhaust deliver smooth power, while Microcomputer Ignition adjusts timing to maintain maximum engine performance, economy and power under all conditions
Streamlined Intake
An intake silencer and manifold on the F20 and F15 result in more direct airflow, for minimum noise and maximum power.
Responsive Acceleration
An acceleration pump on the F20 and F15 gives the engine the fuel it needs–when it needs it–like during rapid throttle advance. This ensures responsive acceleration.
| Engine Type | 2 cyl |
| Displacement | 432cc |
| Bore x Stroke | 65 x 65.1mm / (2.56 x 2.56 in) |
| Prop Shaft Horsepower | 25 hp at 5500 rpm, 20 hp @ 5500 rpm, 15 hp @ 5500 rpm |
| Full Throttle RPM Range | 5000 - 6000 |
| Alternator Output at W.O.T. | 16 amp |
| Compression Ratio | 9.3:1 |
| Fuel Induction System | EFI |
| Weight | 57kg (126 lbs) - 65kg (143 lbs) |
| Recommended Fuel | Octane 87 |
| Recommended Engine Oil | Yamalube® 4M (See owner's manual) |
| Recommended Fuel Filtration | Yamaha 10-Micron Fuel/Water Separating Filter (external) |