Yamaha Outboards 300HP | LF300UCB2

Yamaha Outboards 300HP | LF300UCB2: Ultra-Long Counter-Rotation with Integrated Digital Electric Steering

Experience peak performance with the Yamaha LF300UCB2 outboard motor.

This powerful 300HP V6 4-stroke engine is specifically designed for multi-engine offshore installations. It provides precise counter-rotation (left-hand). The LF300UCB2 features integrated Digital Electric Steering (DES) directly within the engine. This innovation ensures an exceptionally clean transom.

Furthermore, it delivers exhilarating power and precise control. Crafted for vessels needing an ultra-long (30-inch) shaft, this model is ideal for deep-V hulls. It integrates seamlessly with Yamaha’s comprehensive Helm Master EX® system. You will enjoy intuitive “drive-by-wire” throttle and shift.

Plus, advanced boat control features, including joystick maneuverability, are at your fingertips. For discerning boaters, the LF300UCB2 is the ultimate choice. It offers sophisticated power, streamlined design, and unparalleled digital integration.

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Why the Yamaha LF300UCB2 Excels in Multi-Engine Offshore Rigs

The Yamaha LF300UCB2 represents a significant advancement in marine propulsion. It is precisely tailored for multi-engine applications. Its counter-rotation is absolutely critical. When paired with a standard rotation F300UCB2, it neutralizes propeller torque. This results in superior tracking and reduced steering effort. It also enhances overall control, especially at low speeds. The groundbreaking integrated Digital Electric Steering (DES) is a key feature. This eliminates external hydraulic components. Therefore, you gain a remarkably clean transom. You also get incredibly smooth, precise, and responsive steering. This comes directly from the engine. This level of integration, combined with the proven 4.2L V6 platform and full Helm Master EX® compatibility, transforms your boating experience. Navigating crowded marinas, holding position, or cruising at speed becomes effortless.

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

Let’s explore the cutting-edge technologies and robust engineering behind the LF300UCB2. These qualities make it a premier choice for high-performance, multi-outboard setups.

Integrated Digital Electric Steering (DES) for Ultimate Control

The defining innovation of the LF300UCB2 is its integrated Digital Electric Steering (DES). This state-of-the-art system builds 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 failure points. This is especially beneficial for complex multi-engine setups.

Seamless Helm Master EX® System Integration

The LF300UCB2 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 LF300UCB2 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. However, the outer engine dimensions remain unchanged. 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 LF300UCB2’s left-hand (counter-clockwise) propeller rotation is paramount for multi-engine configurations. When precisely paired with a standard right-hand rotation F300UCB2, 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.

Optimal 30-inch (Ultra-Long) Shaft Length

The 30-inch (770mm) shaft length of the LF300UCB2 makes it ideal for many larger offshore vessels. It ensures optimal propeller submersion. This minimizes ventilation and cavitation in rough conditions. Thus, you get consistent thrust and efficiency, even in heavy seas. This length is perfect for many deep-V hulls and transom heights that require more than a standard 25-inch shaft.

Exceptional Fuel Efficiency for Extended Range

The LF300UCB2 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 LF300UCB2 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 LF300UCB2 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 LF300UCB2 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 LF300UCB2 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 LF300UCB2 – 30-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: U: 770 mm (30.3 inch) – This 30-inch ultra-long shaft length is ideal for larger offshore vessels.
• Dry Weight: 283 kg (624 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 F300UCB2 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 LF300UCB2’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 LF300UCB2 Advantage

The Yamaha LF300UCB2 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 30-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 offshore fishing, cruising, and recreational adventures.

Ready to experience the confident power and transformative control of the Yamaha LF300UCB2? Contact us today. Discuss your specific multi-engine 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!