by Dom Wiseman

Yamaha have launched the most audacious outboard engine yet with the release of the big, bold and possibly extreme new V8 425 XTO (Extreme Offshore) outboard. They even use Extreme in the name. This is a massive 425-horsepower V8 engine. It was designed from the ground up. This beast is capable of extreme power and thrust and combines a fully integrated power and control system.

The platform is a 5.6 litre, naturally aspirated engine. The big V8 425 XTO has been engineered to drive large props for maximum thrust.


Jason Harris, Yamaha Motor Australia’s Marine Manager said,

“This revolutionary outboard opens up a whole new class of large outboard driven boats, delivering a more reliable, fuel efficient and extremely powerful engine solution for offshore fishing, pleasure, commercial and tourism boats.” This high horsepower engine delivers more than just extreme power, with Yamaha introducing new technologies that have never been seen in the marine industry. “

“Our engineering team have developed an industry-first fully integrated electric steering system that has no mechanical hydraulics or electric pumps. This system is truly revolutionary, with industry leading features like rpm dependant lock to lock adjustment and steering friction adjustment at your fingertips. This ‘steer-by-wire’ system is combined with our updated premium CL7 multifunction touchscreen display, advanced ‘drive-by-wire’ throttle controls and updated feature packed Helm Master joystick docking and positioning system, to create a truly effortless boating experience,” Jason said.

To deliver the ultimate performance, the V8 425 XTO’s uses the first ever four-stroke direct fuel injection power head designed by Yamaha. It is said to deliver the highest compression ratio of any outboard – which is only made possible through direct injection. To ensure this massive power translates directly to the water, Yamaha has exclusively designed a large diameter XTO OS Propeller. A large bladed surface area delivers extreme thrust for unparalleled acceleration, cruising and top-end speeds, as well as complimenting Yamaha’s new exhaust venting technology to provide industry leading reverse thrust and control.

It runs an oversized gear case, hardened gears, a robust, offshore wide-span bracket and engine mounts, and proven plasma fusion technology for increased durability and lighter weight. There is a large 90 Amp power generation system which allows the engine to deliver plenty of charge to run the large array of electrical devices in today’s modern boats.

Engine maintenance and accessibility were also at the forefront of design. An in-water gear lubricant change-out system allows the outboard to be serviced while the boat is still on the water. This saves on expensive slipping costs. The cowling comes apart in sections offering quick and easy access to key parts of the outboard.

This outboard will be available to the Australian marketing in August.