Suzuki DF115B 115HP – FourStroke 20-Inch Shaft

Suzuki DF115B 115HP FourStroke EFI

The Suzuki DF115B is a next-generation FourStroke EFI 115HP outboard engineered for high-compression performance in the North American maritime sector. Built on an optimized 2045cc inline four-cylinder DOHC 16-valve powerhead and weighing 414 lbs, this engine offers a superior power-to-weight ratio for elite vessel performance. This 20-inch shaft model is perfectly matched for performance bay boats requiring dependable outboard propulsion systems with superior mid-range torque and rugged saltwater durability for high-speed coastal transits.

Maximum operational performance for this Suzuki 115HP occurs between 5000 and 6000 RPM, delivering immediate throttle response at the helm. The aggressive 2.59:1 gear ratio facilitates the mechanical translation of the torque curve into rapid hole-shot capability and efficient hull planing. This outboard exemplifies Japanese engineering reliability for offshore salt-water use, maintaining high thermal efficiency while resisting the corrosive effects of harsh environments during professional maritime navigation.

Technical Specifications of Suzuki DF115B

• The 2045cc inline four-cylinder powerhead features a 10.6:1 compression ratio for superior thermal efficiency and torque.
• Multi-Point Sequential Electronic Fuel Injection ensures reliable zero-choke starting and exceptional combustion precision in maritime conditions.
• A specialized 2.59:1 gear ratio provides aggressive hydrodynamic authority for superior boat control and acceleration.
• The fully-transistorized ignition system provides exact spark timing for flawless performance and a silky-smooth idle.
• A robust 12V 40A alternator delivers essential charging power to support high-draw navigation and safety electronics.
• Vibration dampening mounts and redesigned cowlings improve thermal management and reduce noise for a refined boating experience.

High-Compression Engine Tech

The FourStroke EFI 115HP engine technology in the “B” series utilizes a 10.6:1 compression ratio to maximize power output. This sophisticated architecture ensures explosive acceleration across the RPM band, providing the mechanical integrity needed for tournament-level fishing and high-speed coastal transit in demanding offshore environments.

Advanced Fuel Induction

The Multi-Point Sequential Electronic Fuel Injection (EFI) optimizes fuel induction for maximum energy release. This advanced system guarantees instant starting and prevents engine bogging, completely eliminating carburetor-related maintenance while ensuring rapid acceleration and superior fuel economy in the American saltwater maritime environment during long-range runs.

Hydrodynamic Hole-Shot Authority

The hole-shot performance is enhanced by an offset driveshaft that improves transom balance. Its hydrodynamic profile ensures consistent propeller grip in rolling swells, providing the captain with absolute boat control during complex harbor maneuvers and high-speed offshore coastal transits on various performance-oriented boat hulls.

Integrated Charging Authority

Featuring a high-output 40 Amp alternator, this outboard provides consistent charging to keep modern onboard electronics functional. This electrical authority supports multiple high-definition displays and radar systems, ensuring that your power source acts as a reliable battery maintainer during all-day offshore excursions and heavy electrical loads.

Suzuki 115HP Warranty

This Suzuki 115HP is backed by a comprehensive 3-Year Limited Warranty for American boat owners. This factory-level protection covers structural and mechanical defects, ensuring access to genuine replacement parts and certified technicians, reflecting a deep commitment to long-term maritime reliability and next-generation Japanese engineering support.

Performance Hull Application

This 115HP unit is specifically matched for performance aluminum hulls and high-speed fiberglass bay boats. Its high-compression torque and lightweight design make it perfectly suited for professional angling or as a dependable primary power source for modern recreational vessels requiring aggressive maritime authority.

Maintenance & Longevity

Routine oil changes for the 5.5-liter wet sump system are essential for preserving tight engine tolerances in saltwater. Always flush the cooling passages with fresh water after every mission to prevent scale buildup and maintain the high-compression block’s integrity. Pro Tip from the Shop: Always use 87 octane fuel and check the water-detecting fuel filter regularly to protect the high-pressure fuel injectors.