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Yamaha LF300USB 300HP – Counter Rotation DES Integrated 30-Inch
Yamaha LF300USB – 300HP Counter Rotation utilizes a flagship 4.2L V6 four-stroke propulsion architecture with a 30-inch ultra-long shaft and fully integrated Digital Electric Steering (DES). This counter-rotating model is engineered for high-transom multi-engine flagship vessels, eliminating external hydraulic lines to provide a streamlined transom and superior helm responsiveness when navigating offshore swells.
- Precision Shaft Geometry Data: 30-inch ultra-long shaft (Counter Rotation).
- Internal Engine Configuration Type: V6 60-Degree DOHC 24-Valve 4.2L.
- Advanced Fuel Delivery System: Digital Electronic Control (DEC) with Integrated DES.
- Recommended Vessel Application Use: Engineered for high-transom offshore flagship boats and cruisers.
- Factory Protection Service Plan: 3-year limited factory warranty coverage.
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Description
Yamaha LF300USB 300HP Integrated DES
The Yamaha LF300USB 300HP outboard motor is a masterpiece of digital marine propulsion featuring a precision-engineered V6 4.2L 24-valve DOHC engine architecture with integrated steering in a counter-rotation setup. This high-performance powerhead utilizes a massive 4.2-liter displacement while maintaining a dry weight of 600 lbs to ensure an elite power-to-weight ratio for modern offshore vessels. Its 30-inch ultra-long shaft is explicitly designed for reliable marine propulsion systems requiring neutralized steering torque and the smoothness of integrated digital electric steering.
Operational peak performance of the LF300USB 300HP is sustained across a wide 5000-6000 full-throttle RPM range using Integrated Digital Electric Steering (DES) and Helm Master EX compatibility. The specialized 1.75:1 gear ratio provides the mechanical leverage needed to turn larger propellers for immediate hull thrust. US offshore boaters gain improved steering authority and stable tracking during aggressive maneuvers in both open sea and protected harbor environments with neutralized torque.
Technical Specifications of Yamaha LF300USB
- Robust V6 4.2L DOHC 24-valve architecture delivers 300 horsepower with elite volumetric efficiency.
- Sophisticated 272 kg design includes a 30-inch ultra-long shaft for offshore boat transom configurations.
- Integrated Digital Electric Steering (DES) provides effortless vessel handling and precise control.
- Counter-rotation (left-hand) gearcase design balances steering torque in twin-engine installations.
- Digital Electronic Control (DEC) and Helm Master EX compatibility allow for smooth helm management.
- Massive 50-70 amp alternator output ensures navigation radar and digital sonar remain powered.
- Investment is protected by a 3-year limited factory warranty and Japanese maritime engineering.
Integrated DES Technology
The LF300USB features Integrated Digital Electric Steering (DES) to provide a smooth and responsive boating experience without external hydraulic lines. This digital steering system provides a clean bilge while offering adjustable steering friction and precision for the captain. Professional anglers can enjoy effortless vessel command during long offshore tournament days without operator fatigue or mechanical lag during docking maneuvers.
V6 4.2L Integrated Command
The LF300USB utilizes a 24-valve V6 configuration within its robust 4.2-liter engine block to maximize air intake and torque. This mechanical design ensures rapid and responsive hole-shot acceleration even when pushing heavily loaded offshore vessels through chop. Captains experience smooth power delivery and significantly reduced vibration when cruising through heavy coastal sea conditions with integrated digital command and balanced torque.
Routine Maintenance Care
This Digital V6 engine is built with high-quality sacrificial anodes to prevent destructive galvanic corrosion daily in saltwater coastal environments. Regular maintenance of the power trim and tilt system and cooling passages ensures smooth engine operation in harsh conditions. Pro Tip: Flush the internal cooling passages with fresh water after every launch to maintain cooling system integrity and prevent internal salt accumulation.
YAMAHA LF300USB Full Specs
| Engine type | V6 / DOHC / 24 valves |
| Displacement | 4.2L |
| Bore x stroke | 96 x 96 mm (3.78 x 3.78 in) |
| Horsepower | 300hp at 5500 RPM |
| Full-throttle rpm range | 5000 - 6000 RPM |
| Compression ratio | 10.3:1 |
| Fuel induction | Multi-Point Electronic Fuel Injection |
| Recommended fuel | Octane 89 |
| Ignition | TCI Microcomputer |
| Alternator output | 50 - 70 Amp |
| Gear ratio | 1.75:1 |
| Gear shift | Forward, Neutral, Reverse (Counter Rotation) |
| Shaft length | 30 inch |
| Dry weight | 600 lbs (272 kg) |
| Controls | Digital Electronic Control (DEC) |
| Steering | Integrated Digital Electric Steering (DES) |
| Trim and tilt | Power Trim & Tilt |
| Exhaust | Through Propeller |
| Cooling system | Water, Thermostatic Control |
| Lubrication | Wet Sump |
| Oil capacity | 6.3L (6.7 Quarts) with filter |
| Emissions rating | C.A.R.B. 3-Star |
Yamaha LF300USB 300HP Counter Rotation DES Technical Guide
The 4.2L V6 Offshore consumes approximately 26.2 gallons per hour at wide open throttle. Tracking your gallons per hour rate at 3500-4000 RPM cruise is vital for managing fuel on this 30-inch shaft counter-rotation model featuring integrated Digital Electric Steering (DES).
This model features Yamaha’s Phaze Five paint process and integrated DES components. Regularly inspect all sacrificial aluminum anode locations on the bracket and the 30-inch gearcase to prevent galvanic corrosion in saltwater.
The 4.2L V6 engine has an oil capacity of 6.7 US quarts with a filter change. Adhering to the FC-W engine oil capacity is critical for the plasma-fused sleeveless cylinders and DOHC system longevity.
The LF300 features a 70-amp alternator to support the integrated electric steering. A battery with a minimum marine cranking amps rating of 875 MCA is required for reliable operation of the EFI and electronic systems.
This model utilizes Saltwater Series II propellers; for counter-rotation units, the pitch must be matched to the lead engine to achieve the 5000-6000 RPM wide open throttle window.
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