Honda BF115JXDA 115HP – iST 25″ Shaft Standard Rotation

Honda BF115JXDA 115HP iST Digital Silver

The Honda BF115JXDA 115HP iST represents a high-output high-transom digital control, featuring the Intelligent Shift & Throttle (iST) system for a cable-free operating experience. Built on a robust 2.4L DOHC inline 4-cylinder platform, this 25-inch extra-long shaft model is explicitly designed for high-transom offshore bay boats and deep-V cruisers requiring advanced digital marine engines for a premium helm experience. Its fly-by-wire technology eliminates mechanical friction, providing the captain with surgical precision during technical docking maneuvers and engine synchronization in multi-engine vessel configurations.

Operational peak performance is sustained via Honda’s Programmed Fuel Injection (PGM-FI) and the BLAST system, ensuring that 115 horsepower is delivered with immediate authority across the 4500-6000 RPM range. The BF115JXDA features a high-output 55-amp alternator to keep navigation systems and stabilizing gyros fully powered during extended coastal transits. US offshore boaters consistently choose this Silver series iST model for its Lean Burn Control, which optimizes fuel consumption during cruising, and the refined DOHC 16-valve engineering that minimizes vibration throughout the hull.

Intelligent Shift & Throttle (iST)

The iST system provides the captain with a smooth and cable-free operating experience at the helm station through advanced digital signal processing. This fly-by-wire interface allows for precise vessel positioning and synchronization across multiple engines, ensuring the engine reacts instantly to the captain’s input. You gain the tactile control necessary for safe navigation through busy harbors or narrow coastal channels with the reliability of high-speed digital electronics instead of traditional mechanical cables.

High-Displacement 2.4L DOHC Engine

The BF115JXDA utilizes a large 2.4-liter block to provide significantly higher torque and smoother power delivery than standard 115HP competitors with smaller displacements. This balanced architecture reduces mechanical stress and vibration throughout the vessel while providing the torque needed for rapid response under heavy loads. Operators may notice a refined four-stroke quietness with the mid-range pulling power essential for navigating unpredictable coastal inlets or large offshore environments with total authority.

Extra-Long 25-Inch Shaft Authority

The BF115JXDA is specifically calibrated for vessels with 25-inch transom heights, ensuring the lower unit remains deep enough to prevent ventilation in heavy following seas. This extra-long shaft configuration provides superior traction and steering authority for specialized offshore bay boats and deep-V aluminum hulls. US offshore This can provide stable hydrodynamic tracking and improved propeller grip, making the management of high-transom vessels safer and more efficient in rough water.

Advanced BLAST Torque Technology

Honda’s Boosted Low Speed Torque (BLAST) technology proactively advances ignition timing during rapid acceleration to get the boat on plane faster. This system eliminates the “dead zone” often found in 4-stroke outboards, providing a hole-shot that rivals many 2-stroke competitors in the 115HP class. Captains gain improved vessel authority, allowing them to carry heavier loads or pull skiers with the confidence of immediate, high-torque thrust from a dead stop even on heavier fiberglass hulls.

Lean Burn Control ECOmo

Honda’s ECOmo (Economy Controlled Motor) system utilizes a sophisticated lean-burn technology that adjusts the air-fuel mixture based on real-time speed and load for maximum efficiency. At cruising speeds, the engine operates on a leaner mixture to maximize fuel economy without sacrificing smooth operation or mechanical power. This results in best-in-class fuel efficiency, allowing owners to stay on the water longer and reduce their total cost of ownership at the fuel dock throughout the season.

High-Output 55-Amp Charging

The BF115JXDA features a powerful 55-amp alternator (40 amps charging) that provides the highest electrical output in its class to keep all onboard electronics fully powered. This capacity easily supports modern navigation radar, large multi-function displays, and high-draw livewell pumps without draining the primary starting battery. Owners gain the confidence to run complex digital networks throughout the day, ensuring all critical safety and fish-finding gear remains operational during long transits.

Honda 5-Year Limited Warranty

Your investment is protected by Honda Marine’s high-pressure 5-year non-declining limited warranty, which remains consistent from the first day to the last. This warranty reflects the confidence Honda has in their Japanese-engineered components and provides US boaters with peace of mind during every launch.Maintenance note: Follow the manufacturer’s service procedures and lubrication specifications for the engine and gearcase.