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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.

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Features
Specifications

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)

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