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Mercury FourStroke 9.9HP Manual Starting Outboard Engine

84 lbs lightweight and durable outboard:

  • Lightweight: Weighs only 84 lbs, making it easy to transport and mount.
  • Durable: The engine is built with high-quality materials and features a number of features to protect it from the elements, such as a water-cooled cooling system and a wet sump lubrication system.
  • Reliable: Powered by a 9.9 horsepower 4-stroke engine, known for its reliability.
  • Warranty: 3 years warranty.

The Mercury 9.9MH manual starting outboard engine is a powerful and versatile engine that is ideal for a variety of boats, including aluminum tiller, inflatable soft hull, jon, utility, and sail boats. It is built to deliver the type of power, thrust, and control that wider, heavier boats require.

What makes this outboard truly exceptional:

  • Command Thrust gearcase: The Command Thrust gearcase provides more thrust and torque, making it easier to maneuver in shallow water and against wind and waves.
  • Power Tilt: The Power Tilt system makes it easy to adjust the engine’s height for optimal performance.
  • Ratcheting Trim Positions: The ratcheting trim positions make it easy to find the perfect trim setting for your boat and conditions.


Feature Specification
Horsepower 9.9 HP
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 / up to 10% ethanol
Recommended oil Mercury FourStroke Oil 10W-30
Engine protection operator warning system Low oil pressure/Over-rev
Dry weight *Lightest model available 84 lbs
Starting Manual
Cooling system Water-cooled with thermostat
Bore and stroke 2.16 x 1.73″
Exhaust system Through prop


Weight 84 lbs



9.9 HP

Shaft Length

15" (Short), 20" (Long)




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Frequently Asked Questions


What is the best type of RIB for me?

The best type of RIB for you depends on your boating needs and preferences. We offer a wide range of RIBs that are perfect for different types of boating activities.

What is the best outboard motor for my boat?

The best outboard motor for your boat depends on the size and weight of your boat, as well as your boating needs. We offer a wide range of outboard motors that are perfect for different types of boats.

How do I maintain my RIB?

To maintain your RIB, you should clean it regularly, check the tubes for leaks or damage, and store it properly when not in use.

How do I maintain my outboard motor?

To maintain your outboard motor, you should change the oil and filter regularly, check the spark plugs and fuel filter, and store it properly when not in use.

How do I winterize my RIB?

To winterize your RIB, you should drain all water from the engine and hoses, add fuel stabilizer to the fuel tank, and store it in a dry place.

What safety equipment do I need on my RIB?

You should have life jackets, flares, a fire extinguisher, a first aid kit, and an emergency beacon (EPIRB or PLB) on board your RIB.

What is the warranty on your RIBs?

Our RIBs come with a manufacturer’s warranty that covers defects in materials and workmanship.

How long does it take to service a RIB?

The time it takes to service a RIB depends on the type of service required. We offer fast and reliable service to get you back on the water as soon as possible.