Yamaha F300UCB 300HP V6 Offshore 30″ Shaft Outboard Motor

Yamaha 300HP F300UCB V6 Offshore 30in Shaft

The Yamaha 300HP F300UCB is a robust 4.2L V6 powerhouse featuring a 30-inch ultra-long shaft, engineered for large offshore hulls that utilize traditional steering systems or external digital rams. Utilizing a 4166cc big-bore displacement, this engine provides massive torque density without the added weight of conventional steel cylinder liners, thanks to Yamaha’s Plasma Fusion technology. Its mechanical soul is built for structural integrity and thermal efficiency, delivering consistent power for heavy center consoles and coastal cruisers navigating turbulent open waters.

Achieving peak operational value, the F300UCB utilizes Multi-Point Precision EFI and Variable Camshaft Timing (VCT) to refine the air-fuel mixture and maximize torque output across the entire RPM band. The motor is treated with specialized anti-corrosion coatings and marine-grade alloys to prevent galvanic wear during extended saltwater exposure. Maintenance effort is reduced by the 100-hour service schedule and conveniently located service points. This model features a high-output 70-amp alternator (net), ensuring that battery banks and essential navigational safety gear remain fully powered during offshore transits.

Key Features of Yamaha F300UCB

• 4166cc 24-Valve 60-Degree V6.
• 300 Horsepower Prop Shaft Rating.
• 30-Inch Shaft 571 lbs Weight.
• Digital Electronic Control (DEC) Compatible.
• Variable Camshaft Timing (VCT).
• 70 Amp Total Output Alternator (Net).
• 1.75:1 Ratio Performance Gearcase.