Mercury 250HP 250CXXL Counter Rotation Outboard – 30″ Shaft
The 250-horsepower Mercury 250CXXL provides counter-rotation operation with a 30-inch shaft for compatible twin-engine installations. Its configuration helps balance propulsion forces, while correct shaft length supports propeller alignment and predictable handling on larger transoms.
Description
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Mercury 250HP 250CXXL Counter Rotation Outboard Specs
| Brand | Mercury Marine |
| Full Model Code / Part Number | 250CXXL Counter Rotation (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 (Counter Rotation / 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 250CXXL
Is Mercury 250CXXL counter rotating?
Yes. The Mercury 250CXXL is specified as a counter-rotation 250-horsepower outboard with a 30-inch shaft. Its counter rotating lower unit is intended for compatible paired-engine applications requiring opposite rotation. Confirm propeller specification, engine pairing, controls, steering equipment, battery requirements, and boat compatibility before installation.
What transom fits its shaft?
A 30-inch transom is the intended match for this CXXL configuration. Measure the hull before purchase because incorrect shaft length can affect cooling-water pickup, gearcase clearance, propeller immersion, steering response, and twin-engine balance. Accurate measurement supports this ready to bolt marine outboard installation.
Does it use fuel injection?
Yes. This Mercury four-stroke uses an electronic fuel injection system for controlled fuel delivery during starting, acceleration, and cruising. Counter rotation describes the propulsion configuration rather than the fuel system. Verify mounting height, propeller requirements, paired-engine arrangement, steering, and complete rigging before installing this high performance outboard motor.
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