Portland Marine

Information

2025 Yamaha Outboards V8 5.6L 450 hp

Miles from shore. No land in sight. Nothing on your mind but the adventure ahead and the formidable offshore gamefish that await. That’s the beauty of having a reliable Yamaha 5.6L V8 XTO Offshore® behind you. Purpose-built for the rigors of the offshore, the XTO gives you extreme control, precision and durability—and now up to 450 horses. Go further and with more confidence than ever before—the Yamaha XTO Offshore F450 and F425.

The XTO Offshore® 450 packs everything boaters love about the original XTO outboard—the durability, power and reliability—plus extra horses. With impressive stats such as 12.3:1 compression ratio for outstanding fuel economy and power and industry-first features such as an integrated electric steering system and Phase Angle Control Charging, it’s purpose-built for the extremes of going offshore.

• Award-winning Phase Angle Control Charging System

• Available in signature Yamaha gray or new pearlescent white

• 450 hp on less-expensive 89-octane gasoline

• Impressive 5-year Limited Warranty, for pleasure use

Power and Performance

Maximizes power and efficiency by spraying fuel at high pressure directly into the combustion chamber.

A three-stage low-medium-high pressure fuel pump system works, in part, due to two independent, rpm-activated fuel pumps in the Vapor Separator Tank. This unique five-pump system creates an unprecedented fuel injection pressure of up to 2900 PSI to further maximize atomization and efficiency.

Intake tracks enter the cylinder head from the outside of the powerhead. This gives exhaust gases room for a direct route to the lower unit and out through the propeller hub, streamlining the powerhead and improving flow.

With diameters from 16 to 17 1/8 inches, 15 to 27-inch pitches and increased blade surface, XTO propellers complement the torque potential of our V8 XTO Offshore. They also contribute to greater overall thrust.

Convenience and Control

For the ultimate convenience, a technician can drain and replace your outboard’s lower-unit lubricant without having to remove your boat from the water.

For more control at lower speeds and increased precision of our Helm Master® EX boat control system, exhaust is diverted away from the propeller at RPMs below 2,500.

The tilt pump shuts off when it reaches maximum tilt setting, rather than continuing to run, saving power and reducing noise at full trim in/out.

System Integration

The XTO responds quicker to steering inputs because it contains a digital electric steering motor, which directly receives signals from the electric helm to the integrated steering control unit.

Helm Master EX now features more than 10 automated modes, including new DriftPoint® Track, which helps to automate the drifting of an uneven shoreline; new Autopilot with Heading and Course Hold; the expanded ability to control up to five outboards, and more.