Mercury 9.9HP Command Thrust FourStroke
Reliable Power for Smaller Boats
The Mercury 9.9HP Command Thrust FourStroke outboard engine delivers dependable performance, making it an excellent choice for smaller boats, pontoons, tenders, and fishing skiffs. Designed for boaters who want a balanced combination of power, efficiency, and easy handling, this engine brings Mercury’s trusted engineering to every outing. Whether you’re cruising calm waters or heading into light chop, the Command Thrust FourStroke keeps you moving with confidence.
Commanding Thrust for Enhanced Performance
First and foremost, the Command Thrust design provides increased torque and improved low-end power, giving you better acceleration and stronger pulling ability. As a result, you enjoy confident planing and quicker responsiveness when you need it most. This makes launching, retrieving, and manoeuvring your boat easier—especially with heavier loads or additional gear on board.
Smooth FourStroke Efficiency
Moreover, the FourStroke technology offers quiet, fuel-efficient operation with minimal vibration and emissions. Unlike older two-stroke engines, the Mercury 9.9HP FourStroke delivers a refined feel that enhances comfort on the water. Consequently, every trip feels smoother and more enjoyable, while fuel savings help extend your time out on the lake or river.
Easy Starting and Dependable Operation
In addition to efficient performance, this engine is engineered for reliable starting and consistent operation. With advanced combustion technology and thoughtful design, it responds well in a variety of temperatures and conditions. Meanwhile, its maintenance-friendly design makes routine servicing straightforward—giving you peace of mind and more time boating.
Built to Last in the Marine Environment
Furthermore, Mercury constructs the Command Thrust FourStroke with durable materials and corrosion-resistant finishes to withstand harsh marine environments. From the rugged lower unit to the solid mid-section, every component contributes to long-lasting performance season after season.
A Versatile Choice for Adventurous Boaters
Ultimately, the Mercury 9.9HP Command Thrust FourStroke combines dependable thrust, efficient FourStroke technology, and durable design in a compact package. Therefore, whether you’re fishing, cruising, or simply enjoying a day on the water, this outboard delivers trustworthy performance you can count on each time you head out.
SPECIFICATIONS
| HP / KW | 9.9 / 7.3 |
| ENGINE TYPE | Inline 2 |
| DISPLACEMENT (CID/CC) | 12.8 / 208 |
| FULL THROTTLE RPM | 5000 – 6000 |
| FUEL INDUCTION SYSTEM | 2-valves per cylinder, single overhead cam (SOHC) |
| 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
Electric |
| STEERING | Tiller |
| SHAFT LENGTH | 20″ / 508mm
25″ / 635mm |
| GEARCASE RATIO | 2.42:1 |
| DRY WEIGHT | 44kg |
| CARB STAR RATING | 3 |
| BORE AND STROKE | 2.16 x 1.73″ / 55 x 44mm |
| 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 | Ratcheting
Power Trim |
| EXHAUST SYSTEM | Through Prop |
| SHALLOW WATER DRIVE | Yes |
| SHALLOW WATER TRIM RANGE (DEGREES) | 16 |
| INTEGRATED FUEL TANK (L / gal) | 12 / 3.2 |
| OPTIONAL FUEL TANK (L / gal) | 12 / 3.2 |
NGK Spark Plug (DCPR6E) (803507) - Mercury
Mercury 2.5HP Fourstroke 





