Yamaha Outboards 300HP | LF300ECB2: Precision Counter-Rotation for Extreme Offshore Performance

Take command of the most challenging waters with the Yamaha LF300ECB2 outboard motor.

This robust 300HP V6 4-stroke engine is expertly engineered for multi-engine offshore installations. It delivers crucial counter-rotation (left-hand).

The LF300ECB2 boasts innovative integrated Digital Electric Steering (DES) directly within the engine. This design creates an exceptionally clean and uncluttered transom. Crafted specifically for vessels demanding an extra-extra-long (35-inch) shaft, it ensures optimal propeller submersion.

This is vital for extreme deep-V hulls and very high transom heights. This motor integrates seamlessly with Yamaha’s comprehensive Helm Master EX® system. You will experience intuitive “drive-by-wire” throttle and shift. Moreover, advanced boat control features, including joystick maneuverability and intelligent autopilot, are fully accessible. For the most demanding captains who seek balanced power, precise control, and a streamlined rigging, the LF300ECB2 is an unrivaled choice.

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Why the Yamaha LF300ECB2 Is Indispensable for Large Multi-Engine Rigs

The Yamaha LF300ECB2 represents the pinnacle of marine propulsion technology. It is specifically tailored for multi-engine applications. Its counter-rotation is essential. When paired with a standard rotation F300ECB2, it effectively neutralizes propeller torque. This results in superior tracking and reduced steering effort. It also enhances overall vessel control, especially at low speeds. The groundbreaking integrated Digital Electric Steering (DES) is a core feature. This eliminates external hydraulic components. Therefore, you gain a remarkably clean transom. You also get incredibly smooth, precise, and responsive steering directly from the engine. This level of integration, combined with the proven 4.2L V6 platform and full Helm Master EX® compatibility, completely transforms your offshore boating experience. Navigating challenging channels, holding position in strong currents, or cruising confidently through rough seas becomes remarkably effortless.

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Key Features & Benefits: Balanced Power, Pinpoint Control, and Clean Design

Let’s delve into the cutting-edge technologies and robust engineering that position the LF300ECB2 as a premier choice for high-performance, multi-outboard setups on the largest vessels.

Integrated Digital Electric Steering (DES) for Ultimate Control

The defining innovation of the LF300ECB2 is its integrated Digital Electric Steering (DES). This state-of-the-art system is built directly into the outboard. It eliminates external steering cylinders, pumps, and hydraulic lines. This design offers significant advantages:

• Clean Transom & Bilge: You will notice no exposed steering components. This creates a vastly cleaner and more spacious boat stern. It also simplifies maintenance.
• Precise & Responsive Steering: Enjoy fingertip control. You get instant, silky-smooth steering response. This enhances maneuverability at all speeds, crucial for multi-engine boats.
• Reduced Power Draw: DES only draws power when actively steering. Therefore, it is highly efficient.
• Simplified Rigging: Installation is cleaner. Also, there are fewer potential points of failure. This is especially beneficial for complex multi-engine setups.

Seamless Helm Master EX® System Integration

The LF300ECB2 is designed for full compatibility with Yamaha’s modular Helm Master EX® boat control system. With integrated DES, you unlock the full spectrum of Helm Master EX capabilities. No additional steering components are needed.

• Joystick Control: Experience intuitive, 360-degree boat maneuverability. Docking is effortless. You can make tight turns and precise low-speed maneuvers. This truly transforms how you handle multi-engine boats.
• Autopilot Functionality: Features like Course Hold, Heading Hold, and Track Point enable relaxed, hands-free navigation.
• SetPoint™ Modes: StayPoint™, FishPoint™, and DriftPoint™ automatically maintain your boat’s position or heading. These modes revolutionize fishing or holding steady in current.
• Pattern Steer: Pre-programmed fishing patterns help with precise lure presentation and efficient searching.

Potent 4.2L Big-Bore V6 for Exhilarating Power

At the core of the LF300ECB2 is a formidable 4.2L (4169cc) 60-degree V6 engine. This “big-bore” displacement comes from an advanced plasma fusion process. This process applies to the cylinder walls. It eliminates conventional steel cylinder sleeves. Instead, cylinder walls become 60% harder than steel. Consequently, this allows for larger cylinder bores. This results in significantly more power and torque without increasing outer engine dimensions. This design also contributes to lighter weight, superior cooling, and reduced internal friction. Ultimately, these factors boost both performance and long-term reliability. Expect immediate, exhilarating power delivery when you demand it.

Precision Counter-Rotation for Enhanced Balance

The LF300ECB2’s left-hand (counter-clockwise) propeller rotation is paramount for multi-engine configurations. When precisely paired with a standard right-hand rotation F300ECB2, the opposing forces generated by the propellers effectively neutralize each other. This dramatically reduces steering effort. It also eliminates prop walk. It results in a more stable, balanced, and comfortable ride. Furthermore, it provides superior straight-line tracking and enhanced maneuverability. This is especially true at low speeds and in reverse. This feature is crucial when docking or backing down on fish with a large vessel.

Extra-Extra-Long (35-inch) Shaft Length for Specialized Applications

The 35-inch (897mm) shaft length of the LF300ECB2 is specifically designed for the largest offshore center consoles. It’s also ideal for specialized boats with extremely high transoms. This length ensures optimal propeller submersion. It dramatically minimizes ventilation and cavitation, even in the roughest conditions. Thus, you get consistent thrust and efficiency, maximizing performance for your specific hull design. This length is crucial for preventing prop cavitation on high-performance offshore vessels.

Exceptional Fuel Efficiency for Extended Range

The LF300ECB2 delivers commanding power, yet it boasts outstanding fuel efficiency. Its Precision Multi-Point Electronic Fuel Injection (EFI) system ensures precise fuel metering. It optimizes combustion for excellent economy. This intelligent system, combined with friction-reducing micro-textured cylinder walls, provides superb fuel economy. You’ll extend your cruising range. Therefore, you spend more time enjoying the water and less time at the fuel dock.

High-Output Charging for Extensive Electronics

Modern, well-equipped boats demand substantial electrical power. The LF300ECB2 impressively produces up to 70 gross amps of charging power (55A battery charging). This ample output reliably powers your growing array of onboard electronics. This includes multiple fish finders and sophisticated navigation systems. It ensures all critical systems remain fully operational throughout your longest trips.

Smooth, Quiet, and Refined Operation

Yamaha engineers meticulously refined the LF300ECB2 for impressively smooth and quiet operation. Engine exhaust gases route through a labyrinth of passages. They exit via an idle exhaust relief outlet, greatly reducing sound. The design minimizes vibration and noise. This creates a more comfortable and enjoyable time on the water, even during extended journeys. The new cowling design further dampens sound. It also offers a fresh, modern aesthetic.

Built for Unwavering Durability and Smart Maintenance

The LF300ECB2 is inherently built tough. It withstands the rigors of heavy use and harsh marine environments. Its advanced cowling drain system efficiently drains any water. This protects crucial internal components. Incoming air routes through a labyrinth of passages. These effectively trap and drain water, ensuring maximum reliability. Additionally, the outboard features Thrust Enhancing Reverse Exhaust (TERE). This innovative system keeps exhaust bubbles away from the propeller below 2500 RPM and in reverse. This means the prop bites only clean water. It results in outstanding reverse thrust and control. This is especially helpful when backing down on fish or maneuvering around docks.

For ultimate convenience, the LF300ECB2 includes Yamaha’s exclusive TotalTilt™ Feature. A swift double-tap of the trim button performs a full tilt up or down. This makes trailering and shallow water navigation incredibly quick. This feature is also handy for propeller changes or docking.

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Technical Specifications (Yamaha LF300ECB2 – 35-inch Shaft, Counter-Rotation, Integrated DES):

• Engine Type: 4-Stroke, 24-Valve, DOHC with VCT, 60-degree V6
• Prop Shaft Horsepower: 300 hp (220.6 kW) @ 5500 RPM
• Displacement: 4169 cm³ (4.2L)
• Bore x Stroke: 96.0 x 96.0 mm
• Full Throttle Operating Range: 5000-6000 r/min
• Fuel Induction System: Electronic Fuel Injection (EFI)
• Lubrication System: Wet Sump
• Engine Oil Capacity: 6.3 L (with filter)
• Alternator Output: 70 A (gross, 55A battery charging)
• Starting System: Electric Starter
• Steering: Integrated Digital Electric Steering (DES)
• Trim Control System: Power Trim and Tilt with TotalTilt™
• Gear Ratio: 1.75:1
• Shaft Length: E: 897 mm (35.3 inch) – This 35-inch extra-extra-long shaft length is ideal for extreme high-transom offshore vessels.
• Dry Weight: 288 kg (635 lbs) – Weight with integrated DES. Weight is approximate and depends on specific configuration.
• Propeller Rotation: Counter-clockwise (Left-hand rotation) – Essential for twin/triple engine installations with a standard F300ECB2 to neutralize torque and improve handling.
• Ignition System: TCI Micro-computer
• Recommended Fuel: Unleaded gasoline (minimum 89 octane)
• Cooling System: Raw-water, thermostatically controlled
• Exhaust System: Through propeller hub (with Thrust Enhancing Reverse Exhaust)
• Controls: Digital Electronic Controls (DEC) – Required for full functionality and Helm Master EX compatibility.
• Cowling Design: New, modern design with optional engine-mounted Propeller Indicator Lights (if rigged with Helm Master EX).

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Optimize Your Rig with Genuine Yamaha Accessories:

To truly unlock your LF300ECB2’s full potential in a multi-engine setup, consider integrating these genuine Yamaha accessories:

• Yamaha Helm Master EX® System Components: With integrated DES, you are ready for the complete suite of Helm Master EX joystick control, autopilot, and SetPoint™ features.
• Yamaha CL5 or CL7 Digital Displays: These touchscreen displays provide comprehensive engine data and seamless control for Helm Master EX features.
• Saltwater Series II™ HP Propellers: These high-performance propellers complement Yamaha’s V6 Offshore outboards. They offer excellent performance. Plus, they feature the Shift Dampener System (SDS®) for smoother, quieter shifting. Be sure to select a left-hand rotation propeller. Also, choose the appropriate pitch and diameter for your specific boat.
• Yamaha 10-Micron Water Separating Fuel Filter: This external filter provides superior protection against water and contaminants. It enhances reliability and extends engine longevity.

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Power Your Journey: The Yamaha LF300ECB2 Advantage

The Yamaha LF300ECB2 is more than just a powerful outboard. It is a meticulously engineered system. It delivers the pinnacle of marine performance and control. This outboard embodies Yamaha’s legacy of uncompromising quality, advanced engineering, and unwavering reliability. With its potent 300HP, groundbreaking integrated Digital Electric Steering, versatile 35-inch shaft, counter-rotation, and seamless Helm Master EX® compatibility, it offers unmatched precision and convenience. It’s the ideal choice for boaters. They demand cutting-edge technology, a clean and uncluttered transom, and Yamaha’s legendary performance for their most challenging offshore adventures.

Ready to experience the confident power and transformative control of the Yamaha LF300ECB2? Contact us today. Discuss your specific high-transom or extreme offshore boating requirements. Discover how this advanced outboard can elevate your time on the water. Get a personalized quote. Or, explore our full selection of Yamaha outboards. Our dedicated team is here to help you find the ideal power solution for your next marine adventure!