Honda 140HP BF140ALDA iST Outboard – 20″ Shaft
The 140-horsepower Honda BF140ALDA iST outboard uses a 20-inch shaft for compatible lower-transom boats. Its electronic control system supports precise operation, while correct shaft matching helps maintain propeller position and efficient thrust transfer.
Description
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Honda 140HP BF140ALDA iST Outboard Motor Specs
| Brand | Honda Marine |
| Full Model Code / Part Number | BF140ALDA (Standard Rotation / iST / 20" 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 | L: 20 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) | 215 kg / 474 lbs |
| Standard Warranty | 5 Years Limited Pleasure Warranty |
Common Question of Honda BF140ALDA
What does BF140ALDA iST mean?
iST means Intelligent Shift and Throttle. The Honda BF140ALDA uses electronic commands for compatible shifting and throttle control, paired with a 20-inch shaft for matching transoms. Its 140-horsepower four-stroke powerhead uses an electronic fuel injection system, creating a high performance outboard motor for properly equipped boats.
Is the shaft 20 inches?
Yes. This ALDA configuration uses a 20-inch shaft intended for a corresponding transom height. Measure the hull before purchase and follow the boat builder’s recommendation. Correct shaft placement supports cooling-water flow, gearcase depth, propeller immersion, steering response, and efficient operation of this ready to bolt marine outboard.
Does it require iST-compatible controls?
Yes. Intelligent Shift and Throttle requires compatible electronic controls, harnesses, gauges, battery capacity, steering hardware, and proper rigging. Confirm the complete system before installation, because conventional mechanical controls may not provide the intended engine interface. Correct integration supports smooth gear selection and throttle response from the helm.
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