Yamaha 425 HP XTO Outboard
Yamaha V8 XTO Offshore™ 425 HP Outboard
Yamaha has raised the bar in outboard power technology with the introduction of their new 5.6-liter V8 XTO Offshore™ which offers 425 horsepower and is designed to take Yamaha’s premium quality brand position to a higher level. Combining extreme power and thrust, toughness and reliability, system integration, control, convenience and customer care you’ve come to expect from Yamaha, the V8 XTO Offshore™ is a perfect fit for today’s large center console fishing platforms. Combined with the latest generation of Helm Master® and Yamaha’s CL7™ Display, a touchscreen display which allows you to monitor vital boat functions and the performance of up to four outboards through one gauge, and you have benefits offered nowhere else in the industry.
Pushing large offshore boats requires driving extreme, large propellers, a massive, rugged gear case and an extreme powerhead. The V8 XTO Offshore™ is the first four-stroke powerhead in the outboard industry to use Direct Injection which delivers fuel at high pressure directly into the combustion chamber, rather than the intake track, just before the intake valve which greatly improves atomization and increases the effectiveness of the fuel burn for maximum power and efficiency. The Direct Injection system features five fuel pumps and injection pressure up to 2900 PSI. The three-stage fuel pressure system is in part comprised of two independent fuel pumps within the Vapor Separator Tank that activate at specific, individual RPM to ensure proper fuel flow and delivery, even at very high engine RPM. The V8 XTO Offshore™ also boasts the highest compression ratio in an outboard at 12.2:1 for more “bang” from every spark, as well as better efficiency and power.
The new XTO OS™ propellers feature increased blade surface area and are designed to complement the torque potential of the Yamaha V8 XTO Offshore™. These propellers produce more thrust in both forward and reverse using diameters from 16 to 17⅛ inches.
The In-Bank™ Exhaust feature means intake tracks enter the cylinder head from outside of the powerhead, allowing space for exhaust gases to have a direct route to the lower unit and out the propeller hub for improved flow. In addition to an oversized gear case, hardened gears and as well as a robust, offshore bracket and motor mounts, the V8 XTO Offshore™ features proven plasma fusion technology for durability and lighter weight. A two-stage water pump and dual chamber oil pump are each designed to respond to the heavy loads associated with high RPM operation.
Plasma fusion replaces conventional steel cylinder liners and the micro-textured surface is 60 percent harder than steel and significantly lighter, contributing to increased displacement without increasing the size of the powerhead. The resulting surface also increases fuel economy by decreasing internal friction. Spark plugs made from iridium provide improved throttle response, economy, increased service life and improved power while quad thermostats, two per cylinder bank, yield improved flow and better regulation of engine and oil temperature. A uniquely designed two-stage water pump features a huge rubber water impeller for high pressure and flow while a steel impeller helps provide sufficient water volume even under the most extreme offshore conditions. This configuration provides proper cooling water flow at all RPM for improved temperature control.
The V8 XTO Offshore™ also features an integrated electric steering system, the first of its kind in any outboard, which has no hydraulic lines or linkages. This system responds more quickly than conventional systems to steering inputs and an integrated electric steering means reduced power consumption, clean rigging, and a very neat and orderly bilge area. The V8 XTO Offshore™ also features an Integral Electronic Steering Control Unit that receives signals from the steering cylinder position sensor to for joystick and steering operation. Some of the functions integrated into this electric steering system joystick calibration, lever sensor, toe-in/out adjust, joystick thrust, lock to lock, and steering friction set. Additionally, Helm Master® and the CL7™ Display have also been updated with the launch of the new V8 XTO Offshore™ outboard.
Thanks to a new exhaust-gas relief system, the V8 XTO Offshore™ propellers bite clean water in reverse, which improves maneuvering and provides more control in docking, particularly when the engine is matched with Yamaha’s Fully Integrated Boat Control System, Helm Master®.
Lower unit service is a snap thanks to a unique gearcase lubricant exchange system that allows fluid change in the water. Additionally, the V8 XTO Offshore™ also has superior charging capabilities, providing up to 90 amps of total (gross) power and reaches peak net output around 1,500 RPM where it is needed most. The V8 XTO Offshore™ is also is backed by the best-trained dealer network in the industry and a five-year limited warranty for pleasure use. For further information contact the South Jersey Yacht Sales office.