2025 Yamaha Outboards V8 5.6L 425 hp Base

2025 Yamaha Outboards V8 5.6L 425 hp Base

Swipe to View More

Exterior Colors:

  • Year 2025
  • Make Yamaha Outboards
  • Model V8 5.6L 425 hp
2025 Yamaha Outboards V8 5.6L 425 hp Base

2025 Yamaha Outboards V8 5.6L 425 hp Base

2025 Yamaha Outboards V8 5.6L 425 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® 425 is the result of years of collaboration with top boat designers and has been built from the ground up to provide the ultimate in power and efficiency offshore. With impressive stats such as 12.2:1 compression ratio for impressive fuel economy and power, industry firsts such as an electric steering system and engineering touches such as iridium spark plugs and quad thermostats, it’s purpose-built for extreme power, durability, control and reliability.

Features may include:
  • Phase Angle Control Charging System an award-winning industry first
  • Available in signature Yamaha gray or new pearlescent white
  • 425 hp on less-expensive 89-octane gasoline
  • Impressive 5-year Limited Warranty, for pleasure use

Power and Performance

DIRECT-INJECTION FOUR STROKE

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

EXCLUSIVE FUEL SYSTEM

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.

IN-BANK EXHAUST

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.

Convenience and Control

IN-WATER GEAR LUBE CHANGE SYSTEM

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.

THRUST-ENHANCING REVERSE EXHAUST

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.

PUMP STOP POWER TILT LIMIT

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

DIGITAL ELECTRIC STEERING

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

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.

Engine

Engine Type V8 / DOHC / 32 valves / 4 Valves per Cylinder
Engine Power Prop Shaft: 425hp at 5500 RPM
Displacement 5.6L
Bore 3.78 in (96 mm)
Stroke 3.78 in (96 mm)
Compression Ratio 12.2:1
Throttle Full RPM Range: 5000 - 6000 RPM
Steering Integrated, Electric Actuation | Angle (maximum): 31° from center, either direction
Exhaust Through Propeller (Except in Reverse Under 2500 RPM)
Ignition TCI Microcomputer
Oil Type Recommended: Yamalube® 4M (See owner's manual)
Lubrication Wet Sump
Cooling Recommended: Thermostatic Control
Gear Ratio (Primary) (25/14) 1.79
Gear Shifter Forward, Neutral, Reverse
Induction Direct Injection / Up to 2900 PSI

Spark Plug

Spark Plug ILMAR7E-9 / Iridium

Electric

Starter System: Electric w/ PTT
Alternator Output, Maximum Output at W.O.T.: 100 Amp Gross, Max

Fuel System

Fuel System Ethanol Blend Limit: 10% Maximum
Fuel Type Recommended: Octane 89 | Recommended Filtration: Yamaha 10-Micron Fuel / Water Separating Filter (external)

Dimensions

Length Shaft: 25" - 30" - 35"
Dimensions Degree of Tilt: -4° through +73° | Degree of Trim: -4° through +16° | Mounting Centers: 28.5"

Capacities

Oil capacity 8.2 Quarts (7.8 L) | 7.9 Quarts (7.5 L)

Weights

Weight 952 lbs (432 kg) / 977 lbs (443 kg) / 999 lbs (453 kg)
Dry Weight 25" shaft: 952 lbs (432 kg) | 30" shaft: 977 lbs (443 kg) | 35" shaft: 999 lbs (453 kg )

Features

Features Intake: 32 | C.A.R.B. Rating: 3-Star

Warranty

Warranty Limited 5-Year Pleasure, 3-Year Government, 1-Year Commercial

Product Photography