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Home » Yamaha Outboards » High HP 4-Strokes » High HP Four Stroke XF450
Yamaha has taken the next step forward in premium outboard power, with the introduction of the XTO Offshore 450.
Featuring the same 5.6L big block displacement and long list of features as our original XTO 425, this awesome engine improves the outboard that took the world by storm.
The XTO Offshore 450 now comes with a Phase Angle Control Charging System, which features three-phase, simultaneous charging that produces more net amps at a low RPM – ideal for running high demand devices like gyro stabilisers, air conditioning, sounds systems and more.
For extra convenience, this engine is equipped with Yamaha’s exclusive TotalTiltTM with tilt limiter, resulting in faster and easier engine tilting with a simple double push of the tilt up or down button.
The cowling has also received an upgrade with raised chrome graphics and restyled panels, adding to the XTO’s premium look while embodying the extreme power of this massive outboard.
With the huge success of Yamaha’s industry leading Helm MasterTM EX Autopilot and Joystick system, the XTO 450 Offshore now offers the option of a built-in Propeller light. Installed directly into the engine apron, this cool looking safety feature indicates when one of the Helm MasterTM EX SetPoint modes is active, providing a warning to anyone approaching from the rear of the vessel.
Yamaha has also released two additional XTO prop options. A new XTO EC® prop has been designed to reduce ventilation which can occur when pushing big heavy boats, due to the extreme thrust produced by this engine. For lighter vessels, a new 27-inch pitch prop is also available, providing increased RPM at wide-open throttle for potentially more top-end speed.
With all these improvements, the XTO 450 Offshore offers more power, more technology and more convenience than any other engine in Yamaha’s big horsepower line-up.
Featuring three-phase, simultaneous charging, this system produces more net amps at a low RPM – up to 96 net amps (102 Gross) – meeting the extreme demand for devices like gyro stabilisers, air conditioning, sounds systems and more. This net output is per outboard and is stackable for each outboard, meaning you can achieve up to 480 net amps for quad applications.
Yamaha’s exclusive TotalTilt™ feature provides faster and easier engine tilting, using a simple double push of the tilt up or tilt down buttons. The built-in tilt limiter automatically stops the engine tilt at a set point, to prevent the engine hitting any objects.
This optional feature is available when matched to Yamaha’s exclusive Helm Master EX autopilot and joystick system. The light mounts directly in the rear apron of the outboard, providing a visual safety warning when a Helm Master EX SetPoint mode is active.
The cowling has received an upgrade with raised chrome graphics and restyled panels, adding to the XTO’s premium look while embodying the extreme power of this outboard. A new flush-mounted flushing connection has been added to the front of the engine.
Helm Master® EX is an industry-first fully integrated digital boat control system that delivers next level control over your boat for increased boating and fishing enjoyment. Now available for single and multiple outboard engine applications.
The massive 5.6 Litre, 32 valve, direct fuel-injection, four-stroke engine delivers enough power to push large and heavy offshore boats. The self-tensioning chain immersed in an oil bath ensures quiet, maintenance free and consistent valve timing.
This industry first ‘steer-by-wire’ system uses an electric motor to directly move and secure the outboard, without any hydraulics or electric pump. This delivers very fast, precise, leak free and maintenance-free steering – that uses less power and is packaged in a clean rigging set-up.
We take out the guess work in buying a new outboard, by rigorously testing our engines on Australia's most popular boat brands. See how the F425 performs for acceleration, fuel economy and top-end speed on your favourite boat.
Yamaha offers a range of rigging options to suit every boat. Check out the full suite of controls, gauges, switches, props and other technologies, plus outboard performance data.
The fully integrated power system creates a truly effortless boating experience. The system combines integrated electric steering, ‘drive-by-wire’ throttle controls, Yamaha’s premium CL7 multifunction display and Helm Master joystick docking and positioning controls.
First four-stroke outboard to use direct fuel injection in the outboard industry. A three stage fuel pump system sprays fuel at high pressure directly into the combustion chamber, resulting in better fuel burn, more power and improved fuel efficiency.
The draining and replacement of the lower unit gear lubricant can occur while the boat is docked on the water, making the servicing of larger boats easier, quicker and cheaper.
By designing the cowling in separate, easily removable parts - getting to specific sections of the outboard for servicing is now quicker and easier. This new cowling design also makes it possible to service larger boats while they are docked on the water.
The hydrodynamically designed, oversized gear case enables higher maximum speeds and greater stability when turning. The high quality marine grade stainless steel components and hardened gears have been designed to handle extreme loads and highly corrosive marine environments.
The plasma fusion process creates a cylinder wall surface that is 60% harder than steel, removing the need for conventional steel cylinder sleeves. This significantly reduces weight, improves fuel efficiency and increases the engine capacity, resulting in an improved power-to-weight performance.
Blade slippage is decreased significantly when in reverse due to the exhaust gases being ducted through a ‘relief’ bypass located above the anti-cavitation plate. This improves braking capacity and reduces vibrations through the boat.
Engine Type | 4-Stroke, 32 Valve DOHC Direct V8 |
Bore x Stroke (mm) | 96 x 96 |
Fuel Tank Capacity (l) | |
Displacement (cc) | 5559.0 |
Recommended Maximum RPM | 5000-6000 |
Fuel Management | EFI |
Ignition | TCI |
Lubrication System | Wet sump |
Alternator Output | 102 (Net 96) Amp High Output Alternator |
Gear Ratio | 1.79 (25/14) |
Starter System | Electric |
Operation Method | Steer By Wire |
Trim and Tilt Method | TotalTilt with Tilt Limiter |
Digital Gauges | Optional |
Command Link Gauges | Optional |
Transom Height (mm [inch]) | X: 640 [25.1] | U: 767 [30.1] |
Dry Weight (kg) | X: 447 | U: 458 |
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Chivers Marine
An iconic name in Boating in Western Australia, Chivers Marine has been selling quality marine products since 1958.
The business that Laurie Chivers established over 60 years ago is still family owned and operated with Luke Chivers at the helm.
If you are looking for specialist advice and exceptional value Chivers Marine offers only the best brands supported by the best aftersales service in the industry
Chivers Marine
An iconic name in Boating in Western Australia, Chivers Marine has been selling quality marine products since 1958.
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