Honda 140HP BF140AXDA iST Outboard – 25″ Shaft
With 140 horsepower, iST control, and a 25-inch shaft, the Honda BF140AXDA supports compatible offshore boats. Electronic operation assists responsive commands, while the shaft length helps maintain proper propeller alignment and predictable handling.
Description
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Honda 140HP BF140AXDA iST Outboard Motor Specs
| Brand | Honda Marine |
| Full Model Code / Part Number | BF140AXDA (Standard Rotation / iST / 25" Shaft) |
| Country of Origin | Japan / USA |
| Engine Type & Configuration | 4-Stroke DOHC 16-Valve Inline 4 (VTEC) |
| Horsepower Output (HP / kW) | 140 HP (103 kW) |
| Displacement (cc / cu in) | 2354 cc (144 cu in) |
| Bore x Stroke (mm / in) | 87.0 x 99.0 mm (3.43 x 3.90 in) |
| Maximum RPM Range (Full Throttle Operating Range) | 5000 - 6000 RPM |
| Fuel Induction System | Programmed Fuel Injection (PGM-FI) |
| Ignition System | Microcomputer Controlled Transistorized |
| Starting System | Electric Start with Intelligent Shift & Throttle (iST) |
| Steering System | Electronic Remote Control / iST Compatible |
| Trim & Tilt System | Power Trim & Tilt |
| Gear Ratio & Shift Mechanism | 2.14:1 (Standard Rotation / F-N-R) |
| Exhaust System | Through Prop Hub |
| Recommended Transom Shaft Length | XL: 25 inches |
| Alternator / Charging Output (Amps / Watts) | 40 Amp (Total / 30 Amp Battery Charging) / 480 Watts |
| Recommended Fuel Grade & Oil Type | Regular Unleaded (Min. 86 Octane) / Honda 4-Stroke FC-W 10W-30 |
| Dry Weight (kg / lbs) | 220 kg / 485 lbs |
| Standard Warranty | 5 Years Limited Pleasure Warranty |
Common Question of Honda BF140AXDA
Does BF140AXDA use iST?
Yes. The BF140AXDA uses Intelligent Shift and Throttle for compatible electronic gear selection and throttle commands. This 140-horsepower Honda four-stroke has a 25-inch shaft for tall-transom boats and an electronic fuel injection system, providing a high performance outboard motor configuration for properly equipped helm systems.
What boats need its shaft?
A 25-inch transom is the intended match for this XDA model. Measure the hull according to the boat manufacturer’s procedure before purchase. Correct shaft selection supports cooling-water pickup, gearcase placement, propeller immersion, steering behavior, and trim performance. Proper measurements are required for this ready to bolt marine installation.
Does it require electronic controls?
Yes. The iST system requires compatible electronic controls and rigging components. Confirm the control head, wiring harness, gauges, battery capacity, steering equipment, and installation requirements before mounting. Ordinary mechanical cables may not provide the intended engine interface, so complete system compatibility is essential for dependable shift and throttle operation.
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