Honda 350HP BF350AXDA iST Outboard Motor – 25″ Shaft
The 350-horsepower Honda BF350AXDA iST outboard uses a 25-inch shaft for compatible transom heights. Its electronic iST control supports responsive throttle and shift commands, while the engine’s output provides substantial propulsion for offshore cruising, fishing, and utility use.
Description
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Honda 350HP BF350AXDA iST Outboard Motor Specs
| Brand | Honda Marine |
| Full Model Code / Part Number | BF350AXDA (Standard Rotation / iST / 25" Shaft) |
| Country of Origin | Japan / USA |
| Engine Type & Configuration | 4-Stroke SOHC 60° V8 (32-Valve VTEC) |
| Horsepower Output (HP / kW) | 350 HP (257 kW) |
| Displacement (cc / cu in) | 4952 cc (302 cu in) |
| Bore x Stroke (mm / in) | 89.0 x 99.0 mm (3.50 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 with Automatic Tilt Support |
| Gear Ratio & Shift Mechanism | 1.79:1 (Standard Rotation / F-N-R) |
| Exhaust System | Through Prop Hub |
| Recommended Transom Shaft Length | XL: 25 inches |
| Alternator / Charging Output (Amps / Watts) | 90 Amp (Total / Dedicated Battery Charging) / 1080 Watts |
| Recommended Fuel Grade & Oil Type | Regular Unleaded (Min. 86 Octane) / Honda 4-Stroke FC-W 10W-30 |
| Dry Weight (kg / lbs) | 340 kg / 750 lbs |
| Standard Warranty | 5 Years Limited Pleasure Warranty |
Common Question of Honda BF350AXDA
Does BF350AXDA use iST?
Yes. The Honda BF350AXDA uses Intelligent Shift and Throttle for compatible electronic gear selection and throttle commands. Its 350-horsepower four-stroke powerhead uses an electronic fuel injection system, while the 25-inch shaft suits tall-transom boats. This configuration supports a high performance outboard motor installation with compatible helm equipment.
What boats fit its shaft?
A boat with a 25-inch transom is the intended application for this AXDA model. Measure the hull according to the manufacturer’s procedure before purchase. Correct shaft selection supports cooling-water pickup, gearcase clearance, 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 harnesses, gauges, battery capacity, steering equipment, and installation requirements before mounting. Conventional mechanical cables may not provide the intended engine interface, so complete system compatibility is essential for dependable shifting and throttle response.
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