Mercury 250HP 250XXL 4-Stroke Outboard – 30″ Shaft
The 250-horsepower Mercury 250XXL four-stroke outboard uses a 30-inch shaft for compatible high-transom boats. Its propulsion output supports demanding cruising and fishing, while correct shaft length helps maintain propeller alignment and efficient thrust transfer.
Description
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Mercury 250HP 250XXL 4-Stroke Outboard Specs
| Brand | Mercury Marine |
| Full Model Code / Part Number | 250XXL 4-Stroke (30" Shaft) |
| Country of Origin | USA |
| Engine Type & Configuration | 4-Stroke Inline 6 (Supercharged with Verado SmartCraft) |
| Horsepower Output (HP / kW) | 250 HP (184 kW) |
| Displacement (cc / cu in) | 2600 cc (158 cu in) |
| Bore x Stroke (mm / in) | 82.0 x 82.0 mm (3.23 x 3.23 in) |
| Maximum RPM Range (Full Throttle Operating Range) | 5800 - 6400 RPM |
| Fuel Induction System | Sequential Multi-Port Electronic Fuel Injection (EFI) with Supercharger |
| Ignition System | SmartCraft ECM 0d Digital Inductive |
| Starting System | Electric Start with SmartStart Push Button |
| Steering System | Electro-Hydraulic Power Steering |
| Trim & Tilt System | Smart Craft Power Trim and Tilt |
| Gear Ratio & Shift Mechanism | 1.85:1 (Forward - Neutral - Reverse) |
| Exhaust System | Through Propeller |
| Recommended Transom Shaft Length | XXL: 30 inches |
| Alternator / Charging Output (Amps / Watts) | 70 Amp (Idle Charge Battery Management System) / 882 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) | 275 kg / 606 lbs |
| Standard Warranty | 3 Years Limited Recreational Warranty |
Common Question of Mercury 250XXL
Is Mercury 250XXL a four-stroke?
Yes. The Mercury 250XXL is a 250-horsepower four-stroke outboard with a 30-inch shaft. Its electronic fuel injection system controls fuel delivery during starting, acceleration, and cruising. Confirm controls, steering, battery, wiring, fuel, transom strength, and package contents before installing this high performance outboard motor.
What transom fits its shaft?
A 30-inch transom is the intended match for this XX L configuration. Measure the hull according to Mercury’s instructions before mounting because incorrect shaft length can affect cooling-water pickup, gearcase depth, propeller immersion, steering response, and trim. Correct measurement supports this ready to bolt marine installation.
What should buyers verify?
Verify horsepower suitability, engine weight, transom height, steering hardware, controls, battery capacity, wiring, fuel supply, gauges, and package contents. A 30-inch shaft does not guarantee universal fitment. Confirm the boat’s maximum rated horsepower and follow Mercury installation documentation before repowering or operating the four-stroke powerhead.
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