Honda BF140AK1XCDA 140HP – iST 25″ Shaft Counter Rotation

Honda BF140AK1XCDA 140HP iST Counter Rotation

The Honda BF140AK1XCDA pairs a 2.4L DOHC inline 4-cylinder engine with counter-rotation gearing and iST digital control, built for high-transom vessels in Mulmarine’s offshore marine propulsion lineup that need balanced steering torque. The 2.4-liter block gives a smooth, quiet ride while providing the mechanical strength to push heavy fiberglass hulls through unpredictable coastal sea states.

The Intelligent Shift & Throttle (iST) system gives fly-by-wire command and effortless engine synchronization across the 5000-6000 RPM range. A 55-Amp alternator keeps navigation systems and stabilizing gyros powered on long transits, with Lean Burn Control and refined DOHC VTEC engineering.

Counter-Rotation Gearcase Precision

Built for port-side installation in multi-engine setups, the left-hand rotation gearcase neutralizes steering torque, keeping the vessel tracking straight at high speed and reducing captain fatigue.

iST Intelligent Shift & Throttle

The iST system gives a cable-free operating experience through digital signal processing, allowing precise vessel positioning and instant response to input.

High-Transom 25-Inch Performance

Calibrated for 25-inch transom heights, this shaft keeps the lower unit deep enough to prevent ventilation in heavy following seas, giving stable tracking on offshore bay boats.

DOHC VTEC Valve Technology

Honda’s VTEC provides a camshaft profile that optimizes valve lift and timing for both low-speed torque and high-speed performance.

Proprietary BLAST Torque System

The BLAST system improves hole-shot performance by advancing ignition timing during quick throttle inputs, getting the boat on plane faster under heavy loads.

NMEA 2000 Integrated Networking

This engine is NMEA 2000 certified, displaying fuel flow, RPM, and temperature directly on GPS or multi-function displays.

Industry-Leading Corrosion Protection

Honda’s multi-stage corrosion protection includes double-sealed connectors and a high-quality acrylic resin finish, engineered to withstand aggressive saltwater environments.