Twin Yamaha 300hp DEC Outboards | F300UCB & LF300UCB

Description

Twin Yamaha 300HP DEC Outboards – F300UCB & LF300UCB

The Yamaha 300HP Digital Electronic Control (DEC) Outboards—the F300UCB (standard rotation) and LF300UCB (counter-rotation)—represent the perfect balance of power, efficiency, and cutting-edge technology. Designed for larger offshore boats, high-performance center consoles, and premium cruisers, these twin 300-horsepower outboards deliver smooth, responsive handling and remarkable fuel economy.

Together as a twin set, the F300UCB & LF300UCB ensure optimized performance with counter-rotation capability, eliminating torque steering and providing maximum stability, especially in heavy seas or while maneuvering in tight spaces.

Key Features

• Engine Type: 4.2L V6 Four-Stroke DOHC, 24-Valve

• Horsepower: 300 hp each at 5,500 rpm

• Full Throttle Range: 5,000 – 6,000 rpm

• Fuel Induction System: Electronic Fuel Injection (EFI)

• Throttle & Shift: Digital Electronic Controls (DEC) for seamless precision

• Counter-Rotation: LF300UCB provides counter-rotating propeller capability for twin installations

• Shaft Lengths: 25” (X) and 30” (U) options

• Weight: Approx. 562 lbs each (varies by shaft length)

• Gear Ratio: 1.75:1

• Steering Compatibility: Yamaha’s Helm Master® EX digital control system

• Trim & Tilt: Power Trim & Tilt with a wide operational range

• Alternator Output: 70 Amps (ample power for electronics, lighting, and accessories)

• Cooling System: Thermostatically controlled water cooling with raw-water intake

• Ignition System: Microcomputer-based Transistor Controlled Ignition (TCI)

• Starter System: Electric with Yamaha’s PrimeStart™ for instant ignition

• Lubrication System: Wet sump with easy-access oil changes

• Fuel Type: Unleaded gasoline (89 Octane recommended)

• Corrosion Protection: Yamaha Phaze Five™ paint system and YDC-30 alloy construction

Performance & Efficiency

The 4.2L V6 platform powering the F300UCB and LF300UCB delivers unmatched performance in the 300hp class. Advanced plasma-fused sleeveless cylinders reduce weight and improve cooling, while the Variable Camshaft Timing (VCT) system enhances torque in the low and mid-RPM ranges, ensuring strong acceleration and smooth cruising.

With twin installation, the combination of standard and counter-rotating models provides:

• Balanced Handling: Eliminates “prop walk” and torque pull.

• Straighter Tracking: Enhanced directional stability, even in rough seas.

• Precise Maneuvering: Ideal for docking and navigating tight marinas.

The Digital Electronic Controls (DEC) ensure smooth throttle response and precise gear engagement, while compatibility with the Helm Master® EX joystick system adds next-level control, station selection, and autopilot integration.

Durability & Reliability

• Corrosion Resistance: Yamaha’s proprietary Phaze Five™ anti-corrosion system and YDC-30 alloy provide unmatched protection against harsh saltwater environments.

• Rugged Construction: Plasma-fused cylinder technology reduces wear and heat build-up for longer engine life.

• Maintenance Ease: Features like freshwater flush ports and easy-access oil systems simplify upkeep.

• Heavy-Duty Charging Power: The high-output alternator ensures electronics, trolling motors, and onboard systems always have reliable power.

Applications

The twin F300UCB & LF300UCB are ideally suited for:

• Offshore fishing boats

• High-performance center consoles

• Large dual-console family cruisers

• Luxury sport boats and yachts

• Commercial vessels requiring balanced twin setups

Why Choose Twin Yamaha 300HP Outboards?

• Perfect Balance of Power & Control: With 600 combined horsepower, these twins can propel large boats with ease.

• Smooth, Fuel-Efficient Operation: Advanced EFI and VCT maximize every drop of fuel.

• Superior Handling: Counter-rotating design ensures balanced steering and stability.

• Advanced Digital Controls: DEC and Helm Master® EX deliver effortless operation and enhanced boating confidence.

✅ In summary, the Twin Yamaha 300hp DEC Outboards (F300UCB & LF300UCB) combine reliability, advanced engineering, and precision control. They are built for serious boaters who demand top-tier performance in offshore and high-performance environments while enjoying Yamaha’s legendary durability.