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Yamaha LXF425USB2 425HP – V8 XTO Offshore Counter Rotation 30-Inch
Yamaha LXF425USB2 425HP V8 Counter Rotation XTO Offshore Propulsion slashes maintenance downtime for maritime fleets. The resilient 5.6L four-stroke engineering provides stable industrial load capacity during high-RPM cruising schedules.
- 30-inch extra-long shaft prevents propeller ventilation
- Left-hand rotation balances twin-engine transom torque
- Direct 2900 PSI injection optimizes efficiency
- Integrated electric actuation eliminates hydraulic power loss
- 100-amp gross charging supports heavy electronics
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Description
Yamaha LXF425USB2 425HP V8 XTO Offshore (White)
The premium Yamaha LXF425USB2 425HP stands as the absolute pinnacle of high-horsepower propulsion for the demanding US offshore boating market. Harnessing a massive V8 5.6L 32-Valve DOHC block, this high-output system leverages direct injection up to 2900 PSI to maintain exceptional thermal efficiency under heavy offshore load. Configured with a 30-inch shaft length, this extra-long platform provides the exact physical transom height clearance required by modern deep-V center consoles.
Deploying this specific Yamaha LXF425USB2 counter rotation outboard motor layout is absolutely critical when rigging a multi-engine transom to neutralize severe steering pull. The left-hand counter rotation gearcase effectively balances out the clockwise hydrodynamic forces of its standard rotation twin, establishing a stable running attitude and neutral helm characteristics during long-range open ocean transits.
Primary Specifications of Yamaha LXF425USB2
- A high-pressure direct injection layout feeds fuel into the 5.6L DOHC V8 cylinders at up to 2900 PSI.
- The robust 1.79:1 gear ratio delivers immense low-end torque across the 5000-6000 operating range.
- An integrated thirty-inch extra-long shaft assembly ensures proper lower unit immersion on high-transom hulls.
- Integrated electric steering actuation eliminates heavy external hydraulic lines for a cleaner rigging footprint.
- A heavy-duty 100 Amp gross maximum alternator output ensures continuous power delivery to multi-display offshore electronics suites.
Steering Systems Built for LXF425USB2 Rigging
The factory integrated electric steering actuation framework removes old-school hydraulic pumps completely from the transom area. This advanced engineering delivers immediate helm response, ensuring that close-quarters docking maneuvers and high-speed tracking remain smooth and highly predictable for the captain.
Digital Integration for 425HP V8 XTO Models
Full Helm Master EX and digital electronic control compatibility delivers advanced autopilot tracking and seamless multi-engine digital throttle control directly at the helm. Built with an advanced TCI microcomputer system, this outboard exports critical operating diagnostics and real-time parameters directly to your console screens.
Corrosion Shields of the 443 kg LXF425USB2 Chassis
This premium saltwater corrosion resistant outboard utilizes an advanced multi-layer coating system to safeguard all critical internal aluminum water jackets. Large sacrificial anodes work passively across the 443 kg frame alongside a 3-Star C.A.R.B. emissions rating to yield exceptional environmental resilience in harsh marine slips.
Extended Protection Guarding Yamaha 425HP Powerheads
Your investment is secured by a comprehensive 3-Year Limited factory warranty that highlights structural durability across demanding deployment profiles. This extensive warranty protection gives offshore captains absolute financial reassurance when running through technical open-water passages.
Long-Term Care Protocols for 30 Inch Counter Units
Routine service intervals are simplified by a large 7.8L oil capacity and quad thermostatic water cooling control systems that prevent overheating under load. Pro Tip from the Shop: Change the engine oil filter every hundred hours to keep the massive 7.8L wet sump clean and always verify that all four thermostats actuate uniformly to prevent localized hot spots inside the block.
Yamaha LXF425USB2 425HP - V8 XTO Offshore Counter Rotation 30-Inch Specs
| Engine type | V8 / DOHC / 32 Valves / 4 Valves per Cylinder |
| Displacement | 5.6L |
| Bore x stroke | 96 x 96 mm (3.78 x 3.78 in) |
| Horsepower | 425hp at 5500 RPM |
| Full-throttle rpm range | 5000 - 6000 RPM |
| Compression ratio | 12.2:1 |
| Fuel induction | Direct Injection / Up to 2900 PSI |
| Recommended fuel | Octane 89 |
| Ignition | TCI Microcomputer |
| Alternator output | 100 Amp Gross, Max |
| Gear ratio | 1.79:1 |
| Gear shift | Forward, Neutral, Reverse (Counter Rotation) |
| Shaft length | 30-Inch |
| Dry weight | 443 kg (977 lbs) |
| Controls | Digital Electronic Control (DEC) / Helm Master EX |
| Steering | Integrated, Electric Actuation |
| Trim and tilt | Power Trim & Tilt w/ TotalTilt |
| Exhaust | Through Propeller (Except in Reverse Under 2500 RPM) |
| Cooling system | Water, Thermostatic Control (Quad Thermostats) |
| Lubrication | Wet Sump |
| Oil capacity | 7.8L (8.2 Quarts) with filter |
| Emissions rating | C.A.R.B. 3-Star |
What's in the Box
- 1x 425HP XTO V8 Outboard Motor (White, 30" Shaft)
- 1x Factory-Integrated Counter-Rotation Gearcase Unit
- 1x Factory-Installed Digital Electric Steering System
- 1x High-Output 90A Phase-Angle Alternator Array
- 1x Multi-Pin Primary Engine Rigging Wire Harness
- 1x User Manual
- 1x Warranty Card
Yamaha LXF425USB2 FAQ
What specific fuel delivery method and operating fuel pressure run this V8 XTO powerhead?
High-pressure direct cylinder fuel injection operating up to 2900 PSI feeds the V8 combustion path of the Yamaha LXF425USB2 425HP - V8 XTO Offshore Counter Rotation 30-Inch.
What steering and remote command rigging protocols come standard on this V8 motor package?
Integrated electric actuation steering and Digital Electronic Control (DEC) handle the helm rigging on the Yamaha LXF425USB2 425HP - V8 XTO Offshore Counter Rotation 30-Inch.
What block displacements, gross alternator outputs, and transom weights anchor this platform?
Detailed below are the cylinder configurations, full-throttle load parameters, and physical assembly deadweights matching the Yamaha LXF425USB2 425HP - V8 XTO Offshore Counter Rotation 30-Inch engine:
| Engineering Element | Factory Production Specification |
|---|---|
| Engine Architecture | 5.6L V8 Dual Overhead Camshaft (DOHC) 32-Valve layout generating 425hp at 5500 RPM on 89 octane fuel |
| Lower Gear Ratio | 1.79:1 reduction gear ratio step engineered with left-hand counter rotation gear shifting mechanics |
| Alternator Capacity | 100 Amp gross maximum electrical current charging allocation to support heavy onboard house electronic matrices |
| Dry Weight Profile | Features a robust 443 kg (977 lbs) un-fueled transom installation mass equipped with an extra-long 30-inch shaft |
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