Honda BF140AK1LDA 140HP – iST 20″ Shaft Standard Rotation

Honda BF140AK1LDA 140HP iST Digital Silver

The Honda BF140AK1LDA pairs a 2.4L DOHC inline 4-cylinder engine with VTEC and the iST digital system, built for modern dual consoles, runabouts, and bay boats in Mulmarine’s digital marine engines lineup. The 16-valve DOHC design gives a smooth, quiet ride while providing mechanical authority for rapid hull planing in coastal and freshwater environments.

The Intelligent Shift & Throttle (iST) system gives fly-by-wire command across a 5000-6000 RPM range. The BF140AK1LDA runs a 2.14:1 gear ratio and a 55-Amp alternator, suited to vessels with high-draw electronics and multi-battery systems, with Lean Burn Control extending range.

Massive 2.4L DOHC Displacement

The 2.4-liter block gives higher torque and smoother power delivery than standard 140HP competitors with smaller displacements, reducing mechanical stress and vibration.

Intelligent Shift & Throttle (iST)

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

VTEC Variable Valve Technology

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

Advanced BLAST Torque Technology

Honda’s BLAST technology advances ignition timing during rapid acceleration, cutting the hesitation common in four-stroke outboards for a strong hole-shot even on heavier fiberglass hulls.

Lean Burn Control ECOmo

Honda’s ECOmo system adjusts the air-fuel mixture based on real-time speed and load, running a leaner mixture at cruising speed to maximize fuel economy.

High-Output 55-Amp Charging

The 55-Amp alternator (40 Amps charging) supports navigation radar, large multi-function displays, and high-draw livewell pumps without draining the starting battery.

Honda 5-Year Limited Warranty

This engine carries Honda Marine’s 5-year non-declining limited warranty. Pro Tip: use Honda’s genuine 10W-30 marine oil and regular fresh-water flushing to protect the internal 2.4L block.