Mercury 400HP 400L Verado V10 Outboard – 20″ Shaft
The 400-horsepower Mercury 400L Verado V10 uses a 20-inch shaft for compatible transom heights. Its V10 configuration provides substantial propulsion, while correct shaft matching helps maintain propeller depth and efficient thrust transfer during offshore cruising.
Description
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Mercury 400HP 400L Verado V10 Outboard Specs
| Brand | Mercury Marine |
| Full Model Code / Part Number | 400L Verado V10 (20" Shaft) |
| Country of Origin | USA |
| Engine Type & Configuration | 4-Stroke 64° V10 (DOHC with 4-Valves per Cylinder) |
| Horsepower Output (HP / kW) | 400 HP (298 kW) |
| Displacement (cc / cu in) | 5700 cc (349 cu in) |
| Bore x Stroke (mm / in) | 90.0 x 89.0 mm (3.54 x 3.50 in) |
| Maximum RPM Range (Full Throttle Operating Range) | 5800 - 6400 RPM |
| Fuel Induction System | Electronic Fuel Injection (EFI) Computer Controlled with Sequential Multi-Port |
| Ignition System | SmartCraft ECM 0d Digital Inductive |
| Starting System | Electric Start with SmartStart Push Button |
| Steering System | Electro-Hydraulic Power Steering (Integrated) |
| Trim & Tilt System | Smart Craft Power Trim and Tilt |
| Gear Ratio & Shift Mechanism | 2.08:1 (TorqueMaster / Forward - Neutral - Reverse) |
| Exhaust System | Through Propeller |
| Recommended Transom Shaft Length | L: 20 inches |
| Alternator / Charging Output (Amps / Watts) | 150 Amp (Idle Charge Battery Management System) / 1800 Watts |
| Recommended Fuel Grade & Oil Type | Regular Unleaded (Min. 87 Octane) / Mercury 4-Stroke Outboard Oil NMMA FC-W 25W-40 |
| Dry Weight (kg / lbs) | 316 kg / 695 lbs |
| Standard Warranty | 3 Years Limited Recreational Warranty |
Common Question of Mercury 400L Verado
Is the 400L Verado fuel injected?
Yes. The Mercury 400L Verado V10 uses an electronic fuel injection system within its applicable powerhead. Its 20-inch shaft suits a matching transom, while Verado controls, steering, battery, wiring, and gauges require compatibility. Verify package contents before installing this high performance outboard motor.
What transom fits its shaft?
A 20-inch transom is the intended match for this 400L Verado model. Measure the boat before purchase because incorrect shaft length can affect cooling-water pickup, gearcase depth, propeller immersion, steering response, and trim. Correct measurement supports a properly fitted ready to bolt marine outboard package.
What should buyers verify?
Verify engine weight, maximum horsepower, transom strength, shaft length, Verado controls, steering hardware, battery capacity, wiring, fuel supply, gauges, and package contents. Confirm Mercury’s installation requirements before repowering, because the 20-inch shaft and electronic systems must match the boat’s structure and rigging.
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