Description
Overview & Design Highlights
The Yamaha LXF425USB2 is a top-tier model in Yamaha’s XTO Offshore series, representing an all-new generation of outboard engines tailored for serious offshore applications. Its standout features include:
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A 5.6 L V8 four-stroke engine using direct fuel injection—the first of its kind in its class—delivering lightning-fast throttle response, enhanced torque, and outstanding fuel efficiency.
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Sleek white cowling, offering both aesthetic appeal for high-end vessels and added corrosion resistance.
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Integrated electric steering system, eliminating hydraulic lines and delivering precise, clutter-free control.
Key Technical Specifications
| Feature | Specification |
|---|---|
| Engine Type | 5.6 L V8, 4-stroke, direct injection (up to 2,900 psi), DOHC with VCT |
| Horsepower | 425 HP at ~5,500 RPM |
| Shaft Length | 30″ XX-Long |
| Weight | Approximately 977 lb (443 kg) |
| Alternator Output | Up to 100 A (gross) at W.O.T. |
| Fuel Requirement | Ordinary 89-octane gasoline |
| Trim & Tilt | Power Trim & Tilt |
| Controls | Digital Electronic Controls (DEC) |
| Steering | Integrated Electric Power Steering |
| Warranty | 3-Year Limited (some dealers extend up to 5-Year for pleasure use) |
| Compression Ratio | Around 12.2:1 |
| Exhaust System | Thrust-enhancing reverse exhaust under 2,500 RPM; conventional above |
| Charging System | Phase Angle Control Charging – up to 96 A at idle, supporting quint (5-engine setups) |
| Dual Flush System | Yes |
Performance Insights
Performance bulletins draw from real-world testing:
Twin-engine setup on a Sportsman Open 322 (32 ft boat)
| RPM | Speed (MPH) | Fuel Burn (GPH) | Efficiency (MPG) |
|---|---|---|---|
| 1000 | 6.1–6.5 | 3.8–3.9 | ~1.6 |
| 3000 | ~24.6–24.8 | ~16.9–17.4 | ~1.47 |
| 5500 | ~56.1–56.2 | ~59.2–61.7 | ~0.9 |
| 6000 | ~60.7–63.3 | ~71.3–74.2 | ~0.85 |
Time to plane: ~6.4–6.5 seconds; 0–30 MPH in ~6.9 seconds
Quad-engine setup on a Freeman 47T (47 ft boat)
| RPM | Speed (MPH) | Fuel Burn (GPH) | Efficiency (MPG) |
|---|---|---|---|
| 1000 | 8.0 | 9.1 | 0.88 |
| 3000 | 32.3 | 33.5 | 0.96 |
| 5500 | 66.9 | 123.5 | 0.54 |
| 6000 | 73.1 | 152.5 | 0.48 |
Time to plane: 3.85 s; 0–30 MPH in 5.95 s
Advanced Engineering & Benefits
Efficiency & Power
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High 12.2:1 compression ratio ensures efficient combustion and potent power output
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Phase Angle Control Charging supports heavy electrical loads for modern marine electronics, boasting impressively high net charging even at idle
Low-Speed Handling
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Thrust-enhancing reverse exhaust improves maneuverability, especially in low-speed situations or tight docking maneuvers
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Pump-stop power tilt limit, conserving energy and minimizing noise during maximum trim.
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Wide-span mounting reduces vibration and improves engine support
User-Centric Design
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The electric steering system integrates seamlessly into vessel controls, delivering improved responsiveness and eliminating fluid maintenance hassles
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Digital Electronic Controls (DEC) enable smooth and intuitive throttle and shift operations
Applications & Ideal Use Cases
The Yamaha 425 HP LXF425USB2 is purpose-engineered for:
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Offshore fishing rigs, sportfishing, center consoles, and performance cruisers.
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Multi-engine setups for large, heavy vessels demanding precise handling and formidable electrical power.
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Boaters seeking advanced technology, rapid acceleration, and system integration in a visually premium package.
Its combination of strength, control, efficiency, and refined aesthetics makes it a flagship choice in the offshore outboard category.
Summary
The Yamaha 425 HP LXF425USB2 XTO Offshore is a high-performance, technologically advanced outboard designed for those serious about offshore boating. With its:
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5.6 L V8 direct-injection power,
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Integrated electric steering,
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Phase Angle Control Charging,
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Efficient reverse exhaust,
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Elegant white finish,
…this engine offers an elite blend of power, reliability, and convenience—backed by Yamaha’s trusted marine reputation.
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