Honda BF140ALDA 140HP Outboard – 20in Shaft, iST, Drive-by-Wire

Upgrade a compatible bay boat or sport hull with the Honda BF140ALDA 140HP Outboard when a 20-inch transom needs iST digital control and a higher horsepower option. Its 2,354 cc inline four-cylinder DOHC engine uses 16 valves and VTEC technology, producing 140 HP at 5,500 RPM. Honda BF140ALDA is a Signature Silver 4-stroke outboard with Programmed Fuel Injection, electric starting, Intelligent Shift and Throttle, and Power Trim & Tilt. The 20-inch long shaft is intended for standard long-transom installations.

The 472-lb dry weight should be included in the boat’s transom, repower, and balance calculations. The full-throttle range of 5,000–6,000 RPM provides a useful reference for propeller selection after the boat is rigged. Its 40-amp alternator supplies 30 charging amps for compatible displays, lighting, pumps, and other electrical accessories. The listed engine oil capacity is 6.7 L with filter. Gearcase lubricant requirements, flush procedures, and service intervals should be confirmed in the applicable Honda documentation.

Honda BF140ALDA iST 20-Inch Outboard for Digital Bay Boats

• Fit the 20-inch long shaft to boats designed for compatible standard transoms.
• VTEC Powerhead — produces 140 HP at 5,500 RPM from a 2,354 cc DOHC four-cylinder engine.
• Intelligent Shift and Throttle provides drive-by-wire operation for supported digital helm systems.
• 472 lbs dry weight belongs in transom, balance, and repower calculations.
• Programmed Fuel Injection manages fuel delivery within the specified Honda 4-stroke configuration.
• Power Trim & Tilt adjusts engine angle from compatible iST controls during normal operation.
• 40 amps total with 30 charging amps support onboard marine electronics.
• The 5,000–6,000 RPM range helps verify propeller setup after installation.

Why Choose the Honda BF140ALDA

The iST system gives this 20-inch model a clear role in digital-ready boat installations and repower projects. Its 140 HP output provides more power for approved bay boats and sport hulls, while the long shaft matches a common transom height used by many recreational vessels.

• iST controls suit digital-ready helm layouts
• 140 HP supports properly rated sport hulls
• 20-inch shaft fits compatible long transoms

Applications & Use Cases

Honda BF140ALDA is suited to bay boats, sport hulls, center consoles, and other recreational vessels designed for a 20-inch transom and compatible iST controls. It can be used for fishing, coastal cruising, family boating, and harbor travel when the boat supports the engine’s weight and horsepower.

• Bay boats with digital helm systems
• Sport hulls using 20-inch transoms
• Recreational fishing with iST operation

Warranty, Support & Maintenance

The supplied product information identifies a 5-year non-declining standard warranty. Follow the applicable Honda owner’s manual for the 6.7 L oil capacity with filter, gearcase lubricant service, filters, spark plugs, cooling-system inspection, iST controls, and Power Trim & Tilt. Confirm digital compatibility, warranty registration, dealer support, and regional warranty conditions before purchase.