2025 Yamaha Marine V8 5.6L 425 hp Base

Current Yamaha Marine Outboard XTO-Offshore V8 5.6L 425 hp

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Year 2025
Make Yamaha Marine
Model V8 5.6L 425 hp

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Product Details Specifications Photos

Year 2025
Manufacturer Yamaha Marine
Model Name V8 5.6L 425 hp
Trim Name Base
Generic Type (Primary) General
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

2025 Yamaha Marine V8 5.6L 425 hp

XTO OFFSHORE

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

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)

Features

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

Warranty

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