New
Honda15 HP
Honda BF15
2016 · gasoline
$2,200.00
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Used
Mercury
Mercury SeaPro 225HP
$9,800.00
Durable commercial‑grade 225 HP four‑stroke outboard engine designed for workboats, fishing vessels, and heavy‑duty marine use, featuring a robust 4.6 L V‑8 with electronic fuel injection and SmartCraft compatibility.
Horsepower
225 HP
Fuel Type
gasoline
Year
2021
Hours
487
Displacement
4.6L
Stroke
4-stroke
Rated Output
168 kW / 225 mph
Rated Speed
6000rpm
In Stock (2 available)
Free shipping on orders over $500
90-day warranty included
Description
The 2021 Mercury SeaPro 225 HP is part of Mercury’s commercial SeaPro series, built for longevity, corrosion resistance, and reliable performance in demanding marine environments. Powered by a 4.6‑liter V‑8 engine with dual overhead cams and electronic fuel injection, it delivers strong torque and smooth power across the throttle range. With options for multiple shaft lengths and heavy‑duty alternator output, this outboard is ideal for commercial fishing boats, workboats, and multi‑engine applications.
Specifications
SKUM0930
BrandMercury
CategoryOutboard Engines
ConditionUsed
Horsepower225 HP
Fuel Typegasoline
Year2021
Displacement4.6L
No. of Cylinders8 cylinders
Stroke4-stroke
Shaft Length25
Weight475.00 lbs
Hours487
Rated Output168 kW / 225 mph
Rated Speed6000rpm
Cylinder Bore x Stroke92 mm × 86 mm / 3.62 in × 3.39 in
Combustion System4-stroke, spark-ignited, electronic fuel injection (EFI)
AspirationNatural
Alternator85-amp
Dry Weight215 kg / 475 lbs
ControlsMechanical throttle & shift
Frequently Asked Questions
What type of engine is the Mercury SeaPro 225 HP?
The SeaPro 225 HP is a V-8 four-stroke outboard motor with a 4.6 L displacement, designed specifically for commercial use, workboats, fishing vessels, law enforcement, and other demanding marine applications.
How much horsepower does it produce?
It produces 225 horsepower (168 kW), giving ample power for heavy loads and prolonged operation.
What kind of fuel does the SeaPro 225 use?
It runs on regular unleaded gasoline with a minimum octane rating of 87 (R+M/2) or 90 RON, and can tolerate up to 10 % ethanol.
What fuel system does the engine use?
The engine uses electronic fuel injection (EFI) with Advanced Range Optimization (ARO), which helps improve fuel economy and performance across different loads.
Does it have electric start and trim?
Yes — the SeaPro 225 features electric start with SmartStart protection and power trim & tilt for easy operation and optimal performance.
How does this engine perform at wide-open throttle?
The recommended full-throttle RPM range is 4800–5600 rpm, balancing power and engine longevity.
What shaft lengths are available?
Common shaft lengths available include: 20″ (508 mm) 25″ (635 mm) 30″ (762 mm)
Is the SeaPro 225 suitable for commercial use?
Yes — SeaPro engines are calibrated and built for commercial duty cycles and heavy-load applications, with enhanced durability and prolonged gearcase life compared with recreational models.
What features help reduce maintenance time?
The engine has an industry-exclusive top-cowl access door that allows easy checking or topping off of oil without removing the cowl. Gearcase oil can also be drained easily from the torpedo.
What steering options does it support?
Standard steering is hydraulic, with optional power steering or big tiller handle configurations available depending on your vessel’s setup.
Is the SeaPro 225 compatible with digital gauges?
Yes — it’s compatible with SmartCraft digital technology, allowing integration with compatible instruments for RPM, trim, engine hours, and warning systems.
Can I use this engine in saltwater?
Yes — while designed for commercial durability, if you operate in saltwater you should flush the engine with fresh water after use and follow corrosion-control practices to prolong life and performance.
Is there an operator warning system?
Yes — the SeaPro 225 includes SmartCraft Engine Guardian, a safety system that provides warnings and engine shutdown if critical conditions are detected.
What makes SeaPro different from recreational outboards?
SeaPro models are optimized for commercial duty cycles with heavier gearcases, maintenance-friendly design, robust calibration, and features like idle-charge alternators and top-cowl access for faster servicing.
What maintenance schedule should I follow?
Regular oil and filter changes Gearcase oil service Water pump/impeller inspection Fuel system and filter checks Check the hour-based maintenance decal under the cowl for specific intervals.
How reliable is the SeaPro 225 HP?
SeaPro outboards are built for high torque at lower RPMs, making them durable under heavy operating conditions and suitable for commercial workloads.
Can this engine be used in multi-engine setups?
Yes — SeaPro engines (including the 225 HP) are designed to mount on 26-inch centers, making them adaptable for twin or multiple engine installations with straightforward rigging.
