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Original price was: $11,000.00.$10,500.00Current price is: $10,500.00.
This 2021 Mercury SeaPro V8 225HP outboard is a commercial-duty four-stroke engine built around Mercury’s 4.6-liter V8 platform. The SeaPro V8 225 produces 225 horsepower and is designed for demanding applications where strong low-speed torque, durability, efficient cruising, and dependable electronic control are important. The factory model uses electronic fuel injection, a 64-degree V8 configuration with dual overhead camshafts, and a 4.6L (279.2 cubic-inch) displacement.
The individual engine offered here is listed with 487 hours of runtime, a 25-inch extra-long shaft, and a package that includes a digital gauge, controls, cables, wiring loom, and propeller. The listing also reports compression readings of 190–200 PSI across all cylinders. These are condition details for this particular used engine and should be confirmed during your inspection or pre-purchase testing.
| Specification | Details |
|---|---|
| Model year | 2021 |
| Engine | Mercury SeaPro V8 225 |
| Power | 225 HP / 168 kW |
| Engine type | Four-stroke V8 |
| Displacement | 4.6 L / 4,576 cc / 279.2 cu in |
| Cylinder configuration | 64-degree V8, DOHC, 32 valves |
| Bore × stroke | 92 × 86 mm |
| Full-throttle RPM | 4,800–5,600 RPM |
| Fuel system | Computer-controlled electronic fuel injection (EFI) |
| Air induction | Performance-tuned long-runner intake manifold |
| Gear ratio | 1.75:1 |
| Charging output | 85 amps / 1,071 watts with idle charge |
| Starting | Electric start with SmartStart protection |
| Controls | Remote mechanical or Digital Throttle & Shift (DTS) |
| Steering | Hydraulic standard; power steering available depending configuration |
| Shaft options | 20 in, 25 in, and 30 in |
| Trim and tilt | Power trim and tilt |
| Gear shift | F-N-R |
| Dry weight | From approximately 527 lb / 239 kg, depending configuration |
| Fuel | Regular unleaded, 87 octane minimum (R+M/2); maximum 10% ethanol |
| Engine oil | NMMA Certified FC-W SAE 25W-40; 10W-30 may be used in cold conditions |
| Oil capacity | 6.6 L / 7.0 US qt with filter replacement |
The SeaPro V8 225 is not simply a high-horsepower recreational outboard. Mercury developed the SeaPro range for demanding commercial operation, with components and mounting systems intended to withstand long working hours. The 4.6-liter V8 gives the 225HP model substantial displacement for its power rating, while Mercury’s Advanced Range Optimization system is designed to improve fuel economy during cruising.
With 225 HP and 168 kW of rated output, this engine can provide the power needed for appropriately rated fishing boats, workboats, patrol-style applications, and other vessels that require substantial outboard propulsion. Final suitability depends on the boat manufacturer’s maximum horsepower rating, transom construction, weight capacity, and the selected shaft and controls.
The Mercury SeaPro V8 225 uses computer-controlled EFI rather than a carbureted fuel system. EFI provides electronically managed fuel delivery and works with Mercury’s engine-control systems to monitor operating conditions. The 225 SeaPro is also compatible with SmartCraft digital technology and uses SmartCraft Engine Guardian protection.
The factory specification supports either remote mechanical controls or Mercury Digital Throttle & Shift depending on the installation. The individual listing states that digital controls, a digital gauge, cables, and wiring loom are included with this engine. Confirm the exact control configuration and all included components before purchase.
This particular listing is described as a 25-inch extra-long shaft. The SeaPro V8 225 factory range is available in 20-inch, 25-inch, and 30-inch shaft configurations, so matching the shaft length to the boat’s transom height is essential.
A 25-inch shaft is commonly associated with boats using an extra-long transom configuration, but the correct measurement must be taken from the boat rather than assumed from the engine listing. Verify the boat’s required shaft length, mounting-hole arrangement, steering system, control system, and rigging before installation.
The listing reports 487 hours of runtime and describes the engine as well maintained. It also reports compression of 190–200 PSI across all cylinders. Because these figures describe the individual used engine rather than a Mercury factory specification, buyers should confirm them with service records, diagnostic data, or an independent inspection where practical.
The listing describes the cowlings as near-immaculate, with minor cosmetic fading on the exhaust trunk and gearbox. A used commercial outboard should still be inspected for corrosion, gearcase condition, propeller damage, oil condition, cooling-water flow, electrical faults, trim-and-tilt operation, and evidence of previous repairs before installation.
Included equipment can affect the value and installation cost of a used outboard. Confirm the exact gauge model, control type, cable condition, wiring connectors, propeller specification, and any SmartCraft components supplied with the engine before completing a purchase.
Before repowering with the Mercury SeaPro V8 225HP, check the boat manufacturer’s maximum rated horsepower and maximum transom weight. The lightest published 225 SeaPro configuration is approximately 527 lb (239 kg), and actual installed weight can increase with controls, steering equipment, propeller, rigging, and accessories.
Also confirm that the boat has the appropriate fuel system, battery capacity, steering equipment, throttle and shift controls, gauge network, and transom structure for the selected configuration. If the existing boat was originally fitted with a different engine, a qualified marine technician should verify compatibility before installation.
Routine maintenance is particularly important on an engine intended for commercial or high-hour operation. Service items include engine oil and filter changes, gearcase lubricant, spark plugs, cooling-system checks, fuel-system inspection, battery and charging-system checks, and inspection of steering, trim, mounts, and propeller components. Follow the applicable Mercury maintenance schedule for the engine’s serial number and operating conditions.
Mercury documentation lists an engine-oil capacity of approximately 6.6 liters (7.0 US quarts) when replacing the oil filter. Always use the correct specification and verify the final oil level according to the manufacturer’s procedure rather than relying only on the nominal capacity.
If you are comparing the SeaPro V8 225 with other used outboards, you can also review the 2004 Mercury 225HP EFI Outboard and the Mercury 60HP Long Shaft EFI ELPT. These engines are substantially different in displacement and output, making them useful comparison points when evaluating power requirements, boat size, and repower costs.
The Mercury SeaPro V8 225 is rated at 225 horsepower, equivalent to approximately 168 kW.
The 225 SeaPro uses Mercury’s 4.6-liter V8 four-stroke powerhead with a 64-degree V8 configuration, dual overhead camshafts, and 32 valves.
The engine has 4.6 liters of displacement, listed by Mercury as 4,576 cc or 279.2 cubic inches.
The published full-throttle operating range is 4,800–5,600 RPM.
Yes. The SeaPro V8 225 uses computer-controlled electronic fuel injection with Mercury’s Advanced Range Optimization system.
The 225 SeaPro is offered in 20-inch, 25-inch, and 30-inch shaft configurations. The individual engine listed here is described as a 25-inch model.
The current listing reports 487 hours of runtime. Because this is a used-engine condition detail, buyers should confirm the hour count through available diagnostic information or service records.
The listing reports 190–200 PSI across all cylinders. These are reported test results for the individual engine, not a factory specification.
Yes. Mercury’s specifications list remote mechanical or Digital Throttle & Shift controls for the 225 SeaPro, depending on configuration.
It can be considered for a repower when the boat is rated for the engine’s horsepower and weight and has compatible transom, steering, fuel, electrical, and control systems. Boat-specific compatibility should be confirmed before installation.
Check the engine hour data, compression results, service history, corrosion, gearcase oil, cooling-water flow, propeller, trim and tilt, steering, charging system, controls, wiring, and any diagnostic fault history. A qualified marine inspection is recommended for a used commercial-duty outboard.
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