Tohatsu MFS115AETUL 115HP – EFI FourStroke 25-Inch Shaft

Tohatsu MFS115AETUL 115HP EFI FourStroke

The Tohatsu MFS115AETUL is a high-authority 115HP outboard engineered for high-transom maritime applications in the North American sector. Built on a robust 1995cc inline 4-cylinder SOHC 16-valve architecture and weighing 326 lbs, this unit provides an power-to-weight ratio for sustained offshore transits. This 25-inch extra-long shaft model is the definitive choice for high-transom walkarounds and large bay boats requiring professional marine propulsion power with maximum propeller reach and rugged mechanical integrity during unpredictable saltwater excursions.

Peak operational performance for this Tohatsu 115HP is maintained between 5000 and 6000 RPM, ensuring consistent heavy-load thrust and thermal efficiency. The specialized 2.08:1 gear ratio facilitates the mechanical translation of the torque curve into rapid hole-shot capability and steady hull planing. This engine exemplifies Japanese engineering excellence for offshore salt-water use, ensuring the corrosion-resistant block withstands intense maritime pressure while providing long-term reliability for serious coastal captains.

Technical Specifications of Tohatsu MFS115AETUL

• The 1995cc inline 4-cylinder SOHC 16-valve powerhead delivers energy release and high-torque performance for heavy loads.
• Electronic Fuel Injection (EFI) helps support reliable zero-choke starting and thermal efficiency in all maritime weather conditions.
• A specialized 2.08:1 gear ratio provides strong hydrodynamic authority for superior boat control and acceleration on performance hulls.
• The 25-inch extra-long shaft helps support maximum propeller depth to prevent cavitation in rolling offshore sea conditions and choppy waters.
• A 41 Amp alternator (492W) delivers essential charging power to support modern navigation displays, fishfinders, and safety electronics.
• Trochoid pump lubrication helps support consistent oil pressure to all critical components during sustained high-RPM offshore operation.

Lightweight Engine Architecture

The FourStroke EFI 115HP engine technology utilizes a refined 2.0L block to maximize power output while minimizing transom weight. This sophisticated architecture helps support strong acceleration across the entire RPM band, providing the mechanical integrity needed for tournament-level fishing and high-speed coastal transit in marine North American saltwater environments while maintaining peak durability.

Precision Fuel Induction

The Electronic Fuel Injection system monitors atmospheric variables to provide the appropriate combustion ratio for peak energy release. This technology is designed to support instant starting and prevents engine bogging, completely eliminating carburetor-related maintenance while providing rapid acceleration and clean combustion for professional long-range trips in performance-driven coastal saltwater maritime environments.

Extra-Long Shaft Reach

This unit’s hole-shot performance is stabilized by a 25-inch hydrodynamic shaft designed for extra-high offshore transoms. Its profile helps support consistent propeller grip in deep swells, providing the captain with boat control during complex harbor maneuvers and high-speed offshore coastal transits where propeller ventilation must be avoided entirely during professional navigation in choppy waters.

Tohatsu 5-Year Warranty

Every Tohatsu MFS115A is backed by a comprehensive 5-Year Limited Warranty for American boat owners. This high-pressure protection covers structural and mechanical defects, ensuring access to genuine replacement parts and certified technicians through a vast nationwide dealer network, reflecting a deep commitment to long-term maritime reliability and professional technical support across the coast.

High-Transom Vessel Application

This 115HP unit is specifically matched for high-transom fiberglass center consoles and offshore walkarounds. Its high-torque output and extra-long shaft reach make it perfectly suited for coastal fishing or as a dependable primary power source for large recreational vessels requiring sustained maritime authority in rolling deep-water environments along the American coast.

Maintenance & Longevity

Routine oil changes for the 4.2-liter oil capacity are essential for preserving the engine’s tight mechanical tolerances under heavy displacement loads. Freshwater flushing after every excursion prevents internal salt deposits and maintains the cooling system health in corrosive maritime climates.Maintenance note: Follow the manufacturer’s service procedures and lubrication specifications for the engine and gearcase.