Mercury 300HP 300XL 4-Stroke Outboard – 25″ Shaft
The 300-horsepower Mercury 300XL four-stroke outboard uses a 25-inch shaft for compatible offshore transoms. Its propulsion output supports demanding cruising and fishing, while the shaft length helps maintain propeller depth and predictable vessel handling.
Description
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Mercury 300HP 300XL 4-Stroke Outboard Specs
| Brand | Mercury Marine |
| Full Model Code / Part Number | 300XL 4-Stroke (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 (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 300XL
Is Mercury 300XL a four-stroke?
Yes. The Mercury 300XL is a 300-horsepower four-stroke outboard with a 25-inch shaft. Its electronic fuel injection system controls fuel delivery across operating conditions, while the configuration suits compatible tall-transom boats requiring a high performance outboard motor. Confirm controls, steering, battery, wiring, fuel, and package contents.
What boats fit its shaft?
Boats designed for a matching 25-inch transom are the intended application. Measure the hull before purchase 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 outboard installation.
What should buyers verify?
Buyers should verify horsepower suitability, shaft length, engine weight, transom capacity, steering hardware, control equipment, battery connections, wiring, fuel supply, gauges, and package contents. A 25-inch shaft does not guarantee universal fitment. Follow Mercury installation documentation and the hull manufacturer’s requirements before repowering or operating the engine.
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