Yamaha LF350USA 350HP 30″ Counter-Rotation Outboard

The Yamaha LF350USA is a 350hp counter rotation outboard designed with a 30-inch ultra-long shaft for multi-engine offshore boats. This 4.3-liter V6 platform handles offshore high-seas operation by distributing its 4256 cc displacement over an optimized dry weight of 642 lbs to maximize rigidity. Crafted explicitly for deep-V sterns, the 30-inch shaft length helps support complete propeller immersion and continuous bite across large catamarans and sportfishing boats navigating open ocean waters.

Sustaining high-speed cruising across offshore tournament distances is easy when running this heavy-duty powerhead within its 5000 to 6000 RPM threshold. The optimized 1.75:1 gear ratio translates internal combustion pressures into a sweeping torque curve to lift wide hulls on plane rapidly. Backed by proven Japanese engineering excellence, the propulsion platform provides mechanical consistency for captains operating far beyond standard coastal cell phone service ranges.

Sleeveless Cylinder Wall Tech

Advanced block engineering treats the cylinder walls of this 24-valve double overhead camshaft V6 to optimize overall thermal efficiency. This build path cuts unnecessary pounds from the powerhead block while drastically accelerating thermal dissipation under severe high-load operations.

Three Stage DFI System

Electronic fuel induction pushes fuel straight into the heart of each intake track for complete combustion cycles. This automated network produces crisp throttle recovery and instant starting capability when navigating treacherous inlets or heavy head seas.

Counter Rotating Gearcase Profile

Oversized drive gears housed inside a hydrodynamic lower unit minimize underwater drag profiles during high-speed cruising maneuvers. This robust engineering dampens heavy gear-shift vibration while maximizing directional tracking on deep-transom multi-engine fiberglass hull configurations.

Integrated Electric Steering System

Integrated electronic steer-by-wire units delete messy external hydraulic lines and valves to provide uncompromised helm response and handling. This digital platform coordinates with a high-capacity 70-amp gross alternator to supply constant power to critical open-water electronics arrays.

Rapid Fluid Servicing Access Point

Unimpeded maintenance access is guaranteed by a multi-piece cowling array that detaches smoothly for immediate dipstick evaluation. Slick drainage pathways isolate waste fluids to allow for quick oil changes right at the marina slips.Maintenance note: Follow the manufacturer’s service procedures and lubrication specifications for the engine and gearcase.