Mercury 4HP FourStroke
Compact Power for Lightweight Boats
The Mercury 4HP FourStroke outboard engine delivers dependable and efficient propulsion for a wide range of small‑boat applications. Designed for tenders, dinghies, inflatables, canoes, and small aluminium boats, this engine combines Mercury’s trusted engineering with easy‑to‑use performance. Whether you’re heading out for a quick trip, a quiet fishing session, or simply cruising calm waters, the Mercury 4HP FourStroke gives you the confidence you need on every outing.
Smooth and Quiet FourStroke Performance
First and foremost, the FourStroke design ensures smooth, quiet operation with minimal vibration. Unlike two‑stroke engines, the Mercury 4HP FourStroke provides refined power delivery that enhances your comfort while on the water. Consequently, every run feels more pleasant and relaxed, allowing you to focus on enjoying your time rather than battling noise and harsh propulsion.
Simple Starting and Responsive Control
Moreover, this outboard is engineered for dependable starts and responsive throttle action. With its thoughtfully designed fuel and ignition systems, the engine starts easily in a variety of conditions, saving you time at the ramp. As a result, you benefit from confident control and smooth acceleration, making manoeuvring and docking more straightforward—even in tight spaces.
Efficient Fuel Use and Low Emissions
In addition, the Mercury 4HP FourStroke offers impressive fuel efficiency that helps you go further on less fuel. With clean combustion and reduced emissions compared with older designs, this engine supports environmentally conscious boating without sacrificing performance. Therefore, you enjoy both lower operating costs and a reduced environmental footprint on every trip.
Durable Build for Marine Conditions
Furthermore, Mercury builds this outboard with corrosion‑resistant materials and a robust design that stands up to challenging marine environments. From its sturdy lower unit to precision internal components, every part contributes to long‑lasting reliability. Meanwhile, straightforward maintenance keeps the engine performing at its best season after season.
A Versatile and Trusted Choice
Ultimately, the Mercury 4HP FourStroke combines smooth, efficient power with reliable performance and user‑friendly control. Therefore, whether you’re equipping a tender, upgrading an older engine, or powering a small boat for family outings, this outboard delivers dependable operation and enjoyable performance on every adventure.
SPECIFICATIONS
| HP / KW | 4 / 2.9 |
| ENGINE TYPE | 1 CYLINDER |
| DISPLACEMENT (CID/CC) | 7.5 / 123 |
| FULL THROTTLE RPM | 4500 – 5500 |
| FUEL INDUCTION SYSTEM | 2-Valve pushrod (overhead valve) |
| RECOMMENDED FUEL | 87 octane compatible (up to 10% ethanol) |
| RECOMMENDED OIL | Mercury FourStroke Oil 10W-30 |
| ENGINE PROTECTION OPERATOR WARNING SYSTEM | Over-rev
Low oil pressure |
| STARTING | Manual |
| STEERING | Tiller |
| SHAFT LENGTH | 15″ / 381mm
20″ / 508mm |
| GEARCASE RATIO | 2.15:1 |
| DRY WEIGHT | 26.2kg / 57lbs |
| CARB STAR RATING | 3 |
| BORE AND STROKE | 2.16 x 1.42″ / 55 x 36mm |
| IGNITION | CDI w/ electronic spark advance |
| FUEL SYSTEM | Carbureted |
| COOLING SYSTEM | Water-cooled with thermostat |
| GEAR SHIFT | F-N-R |
| GEARCASE OPTIONS | Standard |
| TRIM POSITIONS | 6 |
| EXHAUST SYSTEM | Through Prop |
| SHALLOW WATER DRIVE | Yes |
| SHALLOW WATER TRIM RANGE (DEGREES) | 16 |
| INTEGRATED FUEL TANK (L / gal) | 1.1 / 3.3 |
| OPTIONAL FUEL TANK (L / gal) | 12 / 3.2 |






