Yamaha LF350XSA 350HP – DEC 25″ Shaft Counter Rotationin Gray

Yamaha LF350XSA 350HP Digital Counter

The Yamaha LF350XSA 350HP outboard motor represents a high-output modern V6 offshore performance, featuring a high-displacement 4.3L DOHC 24-valve engine architecture in Classic Gray. This powerhead maintains a dry weight of 529 lbs, delivering an high-pressure power-to-weight ratio for high-performance multi-engine offshore hulls. Its 25-inch long shaft and counter-rotation gearcase are explicitly engineered for advanced outboard engine technology requiring neutralized torque and integrated steering precision during heavy oceanic transits. The recommended full-throttle operating range for the LF350XSA 350HP is a wide 5000-6000 full-throttle RPM range using Integrated Digital Electric Steering (DES) and Helm Master EX control systems. The high-performance 1.75:1 gear ratio effectively translates the 4.3L V6 energy into immediate thrust for rapid hull planing under full loads. Boaters use this Japanese-engineered platform for its offshore reliability and precise digital integration in marine sea conditions.

Technical Specifications of Yamaha LF350XSA

- 4.3L V6 DOHC architecture delivers 350 horsepower with superior volumetric efficiency.
- Gray 240 kg design features a 25-inch long shaft for specialized offshore hulls.
- Counter-rotation (left-hand) gearcase design balances steering torque in twin-engine installations.
- Integrated Digital Electric Steering (DES) provides vessel handling and precision control at all speeds.
- Digital Electronic Control (DEC) and Helm Master EX compatibility allow for helm management.
- High-output alternator (50-70 Amps) helps support navigation displays and digital sonar units remain powered.
- Investment is protected by a limited 3-year factory warranty and Japanese maritime engineering excellence.

4.3L High-Output V6 Performance

The LF350XSA utilizes a 4.3-liter engine block to provide the highest torque output in the V6 class. This mechanical design helps support strong hole-shot acceleration and mid-range cruising for the heaviest fiberglass center consoles. Operators may notice available power when navigating heavy offshore inlets or maintaining speed against strong currents and high-displacement loads with smooth V6 operation.

Integrated DES Technology

This 350HP outboard features Integrated Digital Electric Steering (DES) to provide a smooth and responsive boating experience without external hydraulic lines. This digital system provides a clean transom rigging while offering adjustable steering friction for the operator. Professional offshore anglers can enjoy vessel command during long tournament days without operator fatigue or mechanical lag during high-speed maneuvers.

Digital Command DEC Interface

The 350HP outboard utilizes Digital Electronic Control (DEC) to provide a smooth and cable-free throttle and shifting experience at the helm. This system is fully compatible with modern offshore rigging for advanced vessel positioning and synchronization in multi-engine setups. Captains gain control of multiple engine configurations for a complete and modern helm solution on luxury offshore vessels.

Counter-Rotation Torque Balance

The LF350XSA features a specialized left-hand rotation gearcase designed to neutralize propeller torque when paired with a standard F350 motor. This configuration allows for steering and superior tracking stability, especially in following seas or during sharp maneuvers. This can provide improved handling and safety, reducing the physical effort required to keep the vessel on course during extended offshore fishing missions.

Precision EFI Induction

This 4-Stroke 350HP engine incorporates a Precision EFI system to optimize fuel atomization for maximum efficiency in varying maritime climates. Digital engine management helps support smooth throttle response and consistent starting power even in offshore temperatures. You achieve outstanding fuel economy while exploring remote offshore sections far from local marina fuel docks during high-speed transits.

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 helps support 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.