Mercury 9.9 Pro Kicker Specifications
| Engine Model: Mercury Pro Kicker 9.9 |
| Engine Type: 4-stroke 2-cylinder SOHC gasoline outboard engine |
| Total Displacement: 12.8 cu.in (209 cc) |
| Rated Engine Power: 9.9 Hp (7.3 kW) at 6300 rpm |
| Fuel System: Carburetor or electronic fuel fnjection (EFI) |
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The Mercury Pro Kicker 9.9 is a purpose-built
trolling and auxiliary outboard that prioritizes low-speed control and
rugged durability. Its defining characteristics include a deeper
gearcase and a four-blade high-thrust propeller with a matching gear
ratio, providing exceptional thrust and precise trolling authority in
varying conditions. The engine is based on a refined inline two-cylinder
four-stroke powerhead featuring Electronic Fuel Injection (EFI) for
effortless starting and controlled throttle response in all weather
conditions.
The exclusive tiller handle design offers exceptional ergonomics, with
adjustable positioning for port or starboard operation, tilt-angle
locking positions at 45 and 73 deg, and an adjustable throttle grip for
right or left-hand control. The fastest power tilt in the industry
deploys the engine into the water in just five seconds.
Rugged durability is ensured through robust gears and bearings within
the heavy-duty gearcase, and centering straps on tiller models
automatically straighten and lock the outboard when tilted for
trailering or running on plane. The engine incorporates an operator
warning system for low oil pressure and over-rev conditions.
Maximum Power Output: 9.9 Hp (7.3 kW) at the propeller shaft.
Full Throttle Operating Range: 5000 to 6000 RPM.
Engine Type: Inline 2-cylinder, four-stroke with Single Overhead
Camshaft (SOHC).
Displacement: 209 cc (12.8 cubic inches).
Bore and Stroke: 55 mm (2.16 inches) bore and 44 mm (1.73 inches)
stroke.
Fuel System: Electronic Fuel Injection (EFI) on modern models, providing
reliable starting and efficient performance in all weather conditions.
Earlier models may utilize a carburetor.
Ignition System: Capacitor Discharge Ignition (CDI) with electronic
spark advance.
Alternator Output: 6 A (76 W) with charging output optimized for battery
maintenance at trolling speeds.
Starting System: Available in electric start or manual start
configurations.
Steering: Available in tiller handle or remote control configurations.
Engine Management: Features an operator warning system with low oil
pressure and over-rev protection, limiting engine speed to 3000 RPM when
low oil pressure is detected.
Compatible Fuel: Unleaded regular gasoline with a minimum octane rating
of 87, containing up to 10 percent ethanol. Recommended Oil: Mercury
FourStroke Oil 10W-30.
The foundation of the Mercury Pro Kicker 9.9 is a compact and robust
inline two-cylinder block designed for smooth operation and long-term
durability in trolling applications. Configuration: Inline 2-cylinder.
Displacement: 209 cc (12.8 cubic inches). Bore and Stroke: The cylinder
bore is 55 mm (2.16 inches) and the piston stroke is 44 mm (1.73
inches).
Engine Type: Four-stroke, providing clean operation, exceptional fuel
efficiency at low speeds, and quiet running without the need for
pre-mixing fuel and oil. Balancing: The powerhead is balanced to
minimize vibration, and soft-rubber engine mounts isolate vibration from
the boat for a quieter, more comfortable fishing experience.
The cylinder head assembly is designed for efficient gas exchange and
maintenance-free operation, contributing to the engine's reliability and
low-speed tractability. Valvetrain Design: Single Overhead Camshaft
(SOHC) configuration with two valves per cylinder.
Valves per Cylinder: Two, resulting in a total of four valves for the
engine. Valve Train Maintenance: The valve train features lifetime
maintenance-free design, eliminating the need for periodic valve
adjustments. Fuel Induction: The valvetrain supports the Electronic Fuel
Injection (EFI) system, ensuring an optimal air-fuel mixture for clean
combustion and consistent low-speed operation.
The fuel system on modern Mercury Pro Kicker 9.9 models utilizes
advanced electronic controls to provide enhanced reliability and precise
fuel delivery at trolling speeds. Induction System: Electronic Fuel
Injection (EFI) provides precise fuel metering for effortless starting,
controlled throttle response, and superior fuel efficiency across the
entire RPM range, particularly at low trolling speeds.
Fuel Delivery: An electric fuel pump delivers fuel from the tank to the
injector at the required pressure. Recommended Fuel: Minimum 87-octane
unleaded petrol is specified to ensure proper combustion and prevent
engine knocking.
Flood Prevention: The system is designed to prevent engine flooding;
rotating the throttle grip while the engine is not running should be
avoided as it will inject fuel into the engine and cause a possible hard
starting flooded condition.
The four-stroke design incorporates a self-contained, high-pressure
wet-sump lubrication system ensuring all moving parts are properly oiled
for long-term durability. System Type: Wet sump, with engine oil stored
in a sump within the oil pan. Oil Capacity: The engine oil capacity is
0.8 liters (27.0 fluid ounces). Recommended Oil: Mercury FourStroke Oil
10W-30 is specified for optimal protection and performance.
Oil Filling: Oil is added through the oil fill cap after removal. The
engine must be upright (not tilted) when checking or adding oil to
prevent overfilling. After adding oil, the engine should be idled for
five minutes and checked for leaks, then stopped and the oil level
verified on the dipstick, adding oil if necessary.
Low Oil Pressure Warning: A low oil pressure warning light on the tiller
handle or remote control alerts the operator when engine oil pressure is
low. When this light is on or blinking, the engine will run roughly and
will not exceed 3000 RPM. Oil Change System: The engine features a
convenient no-spill oil-change system for cleaner and easier
maintenance.
To manage engine temperature under varying loads and conditions, the
Mercury Pro Kicker 9.9 uses a positive displacement water pump for raw
water cooling. System Type: Water-cooled with thermostat, drawing
outside water through an intake in the gearcase to cool the engine block
and cylinder head.
Core Components: A rubber-impeller water pump, driven by the driveshaft,
pulls water from the lake or ocean. A thermostat regulates the flow to
maintain the engine at its optimal operating temperature for efficiency
and longevity.
Flushing System: A quick-connect flush system is provided for easy
flushing of the cooling system with fresh water after operation in salt
or polluted water.
| Mid Section and Lower Unit |
The mid-section houses the exhaust and driveshaft, while the lower unit
is specifically engineered for high-thrust trolling applications,
defining the Pro Kicker's specialized performance.
Gearcase Design: The Pro Kicker features a deeper gearcase compared to
standard 9.9hp models, designed to accommodate a larger gear ratio and a
four-blade high-thrust propeller. The gearcase incorporates robust gears
and bearings for enhanced durability under continuous low-speed load.
Gear Ratio: 2.42:1. Gear Shift: Standard forward-neutral-reverse (F-N-R)
shifting operation. Exhaust: Through-propeller exhaust release for
quieter operation. Skeg: A heavy-duty skeg provides additional
protection for the propeller and gearcase in shallow water operations.
Gearcase Lubrication: The gearcase holds dedicated high-grade marine
gear lubricant, with an easy-change system for convenient maintenance.
Trim Tab: An adjustable trim tab is provided to compensate for propeller
steering torque, reducing steering effort.
The engine is equipped with a power tilt system for effortless
adjustment of the engine's angle relative to the transom, with
additional mechanical trim adjustments. System Type: Power Tilt,
standard on all Pro Kicker models. The power tilt deploys the engine
into the water in just five seconds, the fastest in the industry.
Tilt Function: The power tilt switch, located on the tiller handle or
remote control, lifts the engine out of the water for trailering,
launching, beaching, or shallow water anchoring. Trim Adjustment: A trim
position knob allows the operator to preset the trim angle for optimal
performance. Models feature ratcheting trim with multiple positions.
Tilt Lock: A tilt lock knob locks the engine in the full tilt position
for trailering or storage. Shallow Water Operation: The engine features
a shallow water trim range of 16 deg, allowing operation in very shallow
water.
Kicker Strap: Centering straps (kicker straps) on tiller models
automatically straighten and lock the outboard when tilted fully up,
preventing the engine from turning while trailering or when running on
plane with the main outboard.
Propeller selection is critical for the Pro Kicker 9.9, as its trolling
performance is intrinsically linked to the specialized propeller
designed for its deeper gearcase.
Propeller Design: The Pro Kicker utilizes a custom-matched, four-blade
high-thrust propeller specifically designed for refined trolling speed
authority. This propeller design delivers superior thrust and precise
control at low speeds, enabling anglers to dial in accurate bait
presentations. Propeller Material: Typically constructed from aluminum
for durability and corrosion resistance.
Propeller Selection: The propeller is matched to the engine's gear ratio
and gearcase design to provide optimal thrust for moving heavy boats and
maintaining consistent trolling speeds. The correct propeller allows the
engine to operate within its recommended full-throttle RPM range when
the boat is normally loaded.
Long shaft: 508 mm (20 inches), designed for boats with a standard
transom height.
Extra-long shaft: 635 mm (25 inches), designed for boats with higher
transoms.
Dry Weight: The weight varies by model and shaft length.
The lightest model weighs 49 kg (108 lbs).
Some configurations, such as the 2014 9.9 ELHPT model, have a listed
weight of 44 kg (96 lbs).
Routine Maintenance (Every 100 Hours /
Annually):
Change the engine oil and replace the oil filter. The no-spill
oil-change system simplifies this procedure.
Replace the gearcase lubricant using the easy-change system.
Inspect and clean or replace the spark plugs.
Check and clean the fuel filter.
Inspect the fuel system for leaks or deterioration.
Check and clean the anti-corrosion anodes, replacing them if more than
50 percent eroded.
Lubricate all moving parts and pivot points with Quicksilver or Mercury
Precision Lubricants 2-4-C with PTFE or Special Lubricant 101.
Check the tightness of bolts, nuts, and other fasteners.
Inspect the battery condition and electrolyte levels on electric start
models.
Critical Maintenance Items:
Water Pump Impeller: Should be replaced periodically as preventative
maintenance to prevent overheating due to impeller failure.
Valve Clearance: The SOHC valvetrain is designed to be maintenance-free,
requiring no periodic valve adjustments.
Corrosion Protection: Regularly inspect sacrificial anodes and replace
when deteriorated.
Flushing: Flush the cooling system with fresh water after each use in
saltwater or polluted water using the quick-connect flush system.
Periodic Checks:
Propeller condition for dings, cracks, or fishing line.
Engine mounting hardware for correct torque.
Operation of the power tilt system.
Warning system operation by observing the low oil pressure light at
key-on.
Spark Plugs: Torque to specifications listed in the operator's manual or
service manual.
Propeller Nut: 40 Nm (30 lb-ft).
Gearcase Mounting Nuts: 40 Nm (30 lb-ft).
Engine Mounting Bolts (to transom): 55-60 Nm (41-44 lb-ft).
Fishing Boats: The engine is specifically designed as a dedicated
trolling motor for bass boats, walleye rigs, multi-species boats, and
aluminum fishing boats up to 9 meters (30 feet), providing accurate
speed control for bait presentation. Pontoon Boats: The high-thrust
design provides reliable slow-speed maneuvering and trolling capability
for pontoon boats.
Sailboats: The engine serves as an excellent auxiliary power source for
daysailers and cruising sailboats up to approximately 9 meters (30
feet), offering reliable backup power and maneuvering capability in
harbors. Jon Boats and Utility Boats: Its compact size and lightweight
construction make it suitable for jon boats, inflatable soft hull boats,
and small utility craft.
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