Experience unparalleled power, precision, and efficiency with the Yamaha F300UCB outboard motor.

This commanding 300HP V6 4-stroke engine is meticulously designed for vessels requiring an ultra-long (30-inch) shaft, ensuring optimal propeller bite and performance on boats with tall transoms.

Featuring Yamaha’s advanced Digital Electronic Control (DEC) “drive-by-wire” throttle and shift, the F300UCB delivers incredibly smooth and responsive operation.

It’s fully compatible with Yamaha’s optional Helm Master EX® system (with necessary steering components), providing a versatile platform for advanced boat control.

The F300UCB is the definitive choice for very large center consoles, specific offshore sportfishers, and other high-transom applications that demand powerful, reliable performance and sophisticated digital control.

---

Why the Yamaha F300UCB is the Ideal Choice for High-Transom Vessels

The Yamaha F300UCB is a specialized powerhouse within the revered 4.2L V6 Offshore series. Its ultra-long 30-inch shaft is specifically engineered to ensure the propeller remains deeply submerged, maximizing thrust and minimizing ventilation, even in challenging offshore conditions. This is paramount for vessels with exceptionally tall transoms, providing superior handling and stability. The inclusion of Yamaha’s precise Digital Electronic Control (DEC) system eliminates mechanical cables, translating your helm inputs into instantaneous, refined engine responses. This “drive-by-wire” technology not only enhances your driving experience but also provides the foundation for integrating the comprehensive capabilities of the Helm Master EX® system, allowing you to customize your boat’s control features.

---

Key Features & Benefits: Commanding the Deep with Digital Precision

Let’s explore the cutting-edge technologies and thoughtful engineering that position the F300UCB as a leading choice for discerning boaters with specific high-transom needs.

Potent 4.2L Big-Bore V6 for Unrivaled Output

At the very heart of the F300UCB is a formidable 4.2L (4169cc) 60-degree V6 engine. This “big-bore” displacement is achieved through an advanced thermally applied plasma fusion process on the cylinder walls. This innovative process eliminates conventional steel cylinder sleeves. Instead, the cylinder walls are an impressive 60% harder than steel. Consequently, this allows for larger cylinder bores. This means significantly more power and torque without increasing outer engine dimensions. This design also contributes to lighter weight, superior cooling, and reduced internal friction. All these factors enhance both performance and long-term reliability. Therefore, expect immediate, exhilarating power delivery whenever you demand it.

Digital Electronic Control (DEC) for Smooth, Precise Shifts

The F300UCB features Yamaha’s advanced Digital Electronic Control (DEC) system for both throttle and shift. This “drive-by-wire” technology replaces traditional mechanical cables with electronic signals, providing:

• Silky-Smooth Shifting: Effortless and precise gear changes, enhancing overall driving comfort.
• Responsive Throttle Control: Instantaneous engine response to your throttle inputs, ensuring precise speed management.
• Reduced Rigging Clutter: A cleaner helm and transom area due to the absence of mechanical cables.
• Effortless Multi-Engine Sync: Perfect synchronization in dual or triple engine applications, simplifying operation.

Helm Master EX® System Ready (with Steering Components)

The F300UCB is designed for seamless integration with Yamaha’s optional Helm Master EX® boat control system. While the F300UCB typically utilizes a remote hydraulic steering system, it can be upgraded with Yamaha’s bolt-on Digital Electric Steering (DES) to unlock the full suite of Helm Master EX capabilities, including:

• Joystick Control: Unparalleled maneuverability for effortless docking and precise positioning in tight spaces.
• Autopilot Functionality: Features like Course Hold, Heading Hold, and Track Point for relaxed, hands-free navigation on long stretches.
• SetPoint™ Modes: StayPoint™, FishPoint™, and DriftPoint™ automatically maintain your boat’s position or heading, revolutionizing fishing, waiting at docks, or holding position in current.
• Pattern Steer: Pre-programmed fishing patterns for precise lure presentation and efficient searching.

This modular system allows you to customize your level of boat control to match your specific needs and budget.

Ultra-Long (30-inch) Shaft for Optimal Submersion

The 30-inch (770mm) shaft length of the F300UCB is specifically engineered for boats with an exceptionally tall transom. This extended shaft ensures the propeller remains deeply submerged, minimizing ventilation and cavitation in rough water. This results in:

• Improved Propeller Bite: Consistent thrust and efficiency, even when operating in challenging sea states, ensuring optimal performance from your propulsion system.
• Enhanced Stability: Better handling and less porpoising by keeping the prop securely in the water.
• Ideal Fit: Perfect for custom-built offshore vessels, very large center consoles, and specialized pontoon boats designed for this transom height.

Exceptional Fuel Efficiency for Extended Range

Despite its commanding power, the F300UCB 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, delivers superb fuel economy across the entire RPM range. Thus, you can extend your cruising range. 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 F300UCB impressively produces up to 70 gross amps of charging power. This ample output reliably powers your growing array of onboard electronics. This includes multiple fish finders, sophisticated navigation systems, and other high-demand accessories. Furthermore, this ensures all your critical systems remain fully operational throughout your longest trips.

Smooth, Quiet, and Refined Operation

Yamaha engineers have meticulously refined the F300UCB for an impressively smooth and quiet boating experience. Engine exhaust gases are strategically routed. They pass through a labyrinth of passages. Then, they exit via an idle exhaust relief outlet, significantly reducing sound. The design minimizes vibration and noise, creating a more comfortable and enjoyable time on the water, even during extended journeys.

Built for Unwavering Durability and Smart Maintenance

The F300UCB 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. This occurs below 2500 RPM and when in reverse. This means the prop bites only clean water, resulting in outstanding reverse thrust and control. This is especially helpful when backing down on fish or maneuvering a large vessel in tight spaces.

For ultimate convenience, the F300UCB 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.

---

Technical Specifications (Yamaha F300UCB – Ultra-Long Shaft, Standard Rotation, DEC):

• Engine Type: 4-Stroke, 24-Valve, DOHC with VCT, 60-degree V6
• Prop Shaft Horsepower: 300 hp (223.9 kW)
• 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: Remote Control (Hydraulic or optional bolt-on Digital Electric Steering for Helm Master EX)
• 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 specifically for boats with a tall transom, ensuring proper propeller submersion in all conditions.
• Dry Weight: 268 kg (591 lbs) – Weight is approximate and depends on specific configuration.
• Propeller Rotation: Clockwise (Standard)
• 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.

---

Optimize Your Rig with Genuine Yamaha Accessories:

To truly unlock your F300UCB’s full potential, consider integrating these genuine Yamaha accessories:

• Yamaha Helm Master EX® System Components: Explore joystick control, autopilot, and SetPoint™ features by adding the necessary Helm Master EX components, including the bolt-on Digital Electric Steering for full integration.
• Yamaha CL5 or CL7 Digital Displays: These touchscreen displays provide comprehensive engine data, navigation, and seamless control for Helm Master EX features.
• Saltwater Series II™ HP Propellers: These high-performance propellers are specifically designed to complement Yamaha’s V6 Offshore outboards. They offer excellent performance and feature the Shift Dampener System (SDS®) for smoother, quieter shifting. Ensure you select the appropriate pitch and diameter for your specific boat and application.
• Yamaha 10-Micron Water Separating Fuel Filter: This external filter provides superior protection against water and contaminants, further enhancing reliability and extending engine longevity.

---

Power Your Journey: The Yamaha F300UCB Advantage

The Yamaha F300UCB is more than just a powerful outboard; it is a meticulously engineered system designed to elevate your boating experience on high-transom vessels. It embodies Yamaha’s legacy of uncompromising quality, advanced engineering, and unwavering reliability. With its potent 300HP, advanced Digital Electronic Control, ultra-long 30-inch shaft, and Helm Master EX® compatibility, it offers an unmatched level of control, convenience, and confidence on the water. It’s the ideal choice for boaters who demand cutting-edge technology paired with Yamaha’s legendary performance for their large offshore and specialized recreational vessels.

Ready to experience the confident power and precision control of the Yamaha F300UCB for yourself? Contact us today to discuss your specific boating requirements and discover how this advanced outboard can transform 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!