Mercury 300HP 300CXL Counter Rotation Outboard – 25″ Shaft
Featuring 300 horsepower, counter-rotation operation, and a 25-inch shaft, the Mercury 300CXL supports compatible twin-engine installations. Counter-rotation helps balance thrust, while correct shaft matching supports propeller placement and predictable handling during offshore maneuvering.
Description
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Mercury 300HP 300CXL Counter Rotation Outboard Specs
| Brand | Mercury Marine |
| Full Model Code / Part Number | 300CXL Counter Rotation (25" Shaft) |
| Country of Origin | USA |
| Engine Type & Configuration | 4-Stroke Inline 6 (Supercharged with Verado SmartCraft) |
| Horsepower Output (HP / kW) | 300 HP (221 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 | XL: 25 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) | 272 kg / 600 lbs |
| Standard Warranty | 3 Years Limited Recreational Warranty |
Common Question of Mercury 300CXL
Is Mercury 300CXL counter rotating?
Yes. The Mercury 300CXL is specified as a counter-rotation 300-horsepower outboard with a 25-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.
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, cooling-water flow, propeller requirements, paired-engine arrangement, and complete rigging before installing this high performance outboard motor.
What transom fits its shaft?
A 25-inch transom is the intended match for this CXL model. Measure the hull carefully before purchase because incorrect shaft length can affect cooling-water pickup, gearcase clearance, propeller immersion, steering response, and twin-engine balance. Accurate measurement supports a ready to bolt marine installation.
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