Yamaha LF115XB 115HP – Counter Rotation FourStroke 25-Inch Shaft

Yamaha LF115XB 115HP Counter-Rotation

The Yamaha LF115XB 115HP outboard motor is specifically designed for multi-engine offshore platforms, featuring a high-displacement 1.8L 4-cylinder DOHC 16-valve engine architecture. This robust powerhead maintains a dry weight of 386 lbs, providing an exceptional power-to-weight ratio for twin-engine fiberglass hulls requiring synchronized thrust. Its 25-inch extra-long shaft and counter-rotation gearcase are explicitly engineered for reliable marine propulsion systems requiring neutralized steering torque and stable hydrodynamic tracking during high-speed oceanic transits.

Technical Specifications of Yamaha LF115XB

• Robust 1.8L 4-cylinder DOHC 16-valve design delivers 115 horsepower with elite volumetric efficiency.
• Advanced 175 kg design features a 25-inch extra-long shaft for offshore boat transom configurations.
• Counter-rotation (left-hand) gearcase balances steering torque in twin-engine offshore installations.
• Precision Multi-Point EFI ensures consistent combustion across the 5000 to 6000 throttle RPM band.
• Specialized 2.15 to 1 gear ratio provides mechanical leverage for quick and effortless hull planing.
• High-output 35-amp alternator ensures navigation radar and digital sonar units remain fully powered.
• Investment is protected by a 3-year limited factory warranty and Japanese maritime engineering excellence.

Counter-Rotation Precision

The LF115XB features a left-hand rotation gearcase designed to be paired with a standard rotation F115 for balanced twin-engine setups. This configuration neutralizes propeller torque, allowing the captain to maintain a straight course with minimal steering effort. Boaters experience significantly improved vessel stability and predictable handling when cruising through heavy offshore sea conditions.

DOHC 16-Valve Efficiency

This 4-Stroke 115HP engine utilizes a Double Overhead Cam (DOHC) architecture with four valves per cylinder to maximize air intake. This mechanical design ensures rapid hole-shot acceleration and smooth power delivery even when pushing heavily loaded offshore vessels. You gain the torque needed for technical coastal maneuvers without compromising on fuel economy during long-distance transits.

Multi-Engine Integration

The LF115XB is NMEA 2000 certified, allowing for the seamless transfer of engine data to compatible digital helm displays and sonar units. Captains can monitor engine synchronization, fuel flow, and vital diagnostics for both motors directly from their primary interface. This digital integration enhances the overall boating experience by providing real-time information for optimized vessel management.

Engine Care Protocol

This EFI 4-Stroke is built with high-quality sacrificial anodes and a thermostatic cooling system to prevent destructive galvanic corrosion daily. Regular maintenance of the counter-rotation gearcase lubricant ensures smooth shifting and long-term mechanical reliability in saltwater. Pro Tip: Flush the engine with fresh water after every launch to maintain the cooling system and protect internal components.