High HP Four Stroke XF425

Home » Yamaha Outboards » High HP 4-Strokes » High HP Four Stroke XF425

Yamaha has built an enviable reputation for building highly reliable, technology driven, big horsepower engines. We have now taken this to the extreme with the release of the all-new V8 425 XTO (Extreme offshore) outboard.

This beast of an engine has been designed from the ground up to deliver maximum power and thrust. Powered by a big bore, 5.6 litre, naturally aspirated engine, the XTO Offshore opens up a whole new class of large outboard driven boats, delivering a more reliable, fuel efficient and premium quality engine solution.

The XTO Offshore is not only our most powerful outboard, it is also our most technologically advanced, with the introduction of Yamaha’s first fully integrated power system.

This system combines a revolutionary fully integrated electric steering system, with our premium CL7 multifunction display, advanced ‘drive-by-wire’ throttle controls and Helm Master joystick docking and positioning controls – creating a truly effortless boating experience.

Other key features include an in-water gear lube change system, oversized rugged gear case and hardened gears, massive 90 Amp power-generation system and large diameter XTO OS high thrust prop.

Presented in a very stylish, compact and powerful looking package, this outboard is sure to be the envy of every boat owner.

Helm Master® EX Control System

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.

5559CC V8 Engine

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.

Integrated Electric Steering

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.

F425 Performance Data Reports

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 Outboard Tech

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.

Fully Integrated Power System

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.

High Output Alternator

This powerful three winding, three phase charging system generates up to 90 Amps of electrical power. Additionally, 55 Amps of power can be generated while idling. This high output alternator enables a stable supply of power for running a wide array of electrical devices.

Direct Fuel Injection

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.

In-Water Gear Lube Servicing

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.

Multi-Part Cowling System

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.

Redesigned Lower Unit

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.

Plasma Fusion Cylinders

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.

Thrust Enhancing Exhaust Routing

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.

TECHNICAL SPECIFICATIONS

Engine

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	104 Amp High Output Alternator
Gear Ratio	1.79 (25/14)
Starter System	Electric
Operation Method	Steer By Wire
Trim and Tilt Method	Power Trim & Tilt
Digital Gauges	Optional
Command Link Gauges	Optional

Dimensions

Transom Height (mm [inch])	X: 640 [25.1] \| U: 767 [30.1] \| E: 894 [35.1]
Dry Weight (kg)	X: 442 \| U: 453 \| E: 463

Keep Me Posted

Subscribe to our newsletter to recieve news and stay updated.

Have Questions?
Get in Touch!

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.

BUSINESS HOURS

CONTACT

(08) 9434 1822

sales@chiversmarine.com.au

31 Port Kembla Drive, Bibra Lake WA 6163