MERCURY 9.9 HP 9.9MLH-CT OUTBOARD MOTOR

Description

The Mercury 9.9 HP 9.9MLH-CT outboard motor is the affordable, pull start Command Thrust 9.9. It pairs Mercury’s smooth twin cylinder four stroke with a heavy duty lower unit, a 2.42:1 gear ratio and a 4 blade high thrust propeller, all on a 20 inch long shaft. That makes it one of the best value motors you can buy for pushing heavier boats: sailboats, pontoons, wide jon boats, and trolling kickers. It comes with a 3.2 gallon tank and the Mercury factory warranty. We have it for sale new and ship worldwide.

If you want Command Thrust’s pulling power but don’t need electric start or a battery, this is the model to look at.

On this page:

• Why the Mercury 9.9 HP 9.9MLH-CT outboard motor
• Boats it suits
• Features
• Specifications
• Maintenance
• Alternatives
• Price and shipping
• FAQ

Why the Mercury 9.9 HP 9.9MLH-CT outboard motor

Plenty of boats that use a 9.9 aren’t light planing skiffs. Sailboats, small pontoons, heavy jon boats and bigger fishing boats running a kicker all need push at low speed more than they need top speed. On those boats, a standard 9.9 prop tends to slip, the engine revs, and the boat doesn’t respond the way you’d like.

The Mercury 9.9 HP 9.9MLH-CT outboard motor uses Mercury’s heavy duty lower unit to fix that. The gearcase is bigger and taller, putting the prop deeper in clean water. The 2.42:1 gear ratio turns a 4 blade high thrust prop slower but with more torque. The oversized anti ventilation plate stops air being drawn down into the prop. The same 9.9 horsepower becomes far more useful thrust.

It’s manual start, which keeps the cost down and means there’s no battery or wiring to maintain. The engine itself is Mercury’s 208 cc twin, smooth and easy to start with fresh fuel, with the one handed multi-function tiller, auto ratchet trim and a quiet exhaust through the prop hub. It weighs about 96 pounds.

Model code: 9.9 hp, M manual start, L 20 inch long shaft, H tiller, CT Command Thrust (also called BigFoot on some older listings).

Boats the Mercury 9.9 HP 9.9MLH-CT outboard motor suits

Measure your transom or bracket. About 20 inches means this long shaft is right. About 25 inches means the extra long 9.9MXLH-CT.

• Sailboats and trailer sailers on a bracket
• Small pontoon and deck boats
• Wide, heavy jon boats and utility boats
• Kickers on mid size fishing boats
• Work boats, punts and barges

On a light skiff you want to plane fast, the standard 9.9MLH will be lighter and quicker.

On the water

Clip on the lanyard, put it in neutral, set the choke and pull. Once you shift into gear on a heavy boat, you feel the difference immediately. The boat pulls away firmly, holds a slow speed without surging and stops positively in reverse. That makes docking a sailboat or pontoon far calmer. Full throttle is 5,000 to 6,000 rpm.

Buyer questions

“Manual start on a kicker, is that practical?”

If you can reach the starter handle comfortably, yes. Plenty of anglers run manual kickers happily. If the motor sits where pulling the cord is awkward, the electric start 9.9ELH-CT is worth the extra.

“Can I add charging?”

Yes, an optional 12 volt, 76 watt charging kit can be fitted.

“Is it much heavier than the standard 9.9MLH?”

About 12 pounds heavier, because of the bigger lower unit and prop.

Mercury 9.9 HP 9.9MLH-CT outboard motor features

• Command Thrust (BigFoot) lower unit, 2.42:1 ratio
• 4 blade high thrust aluminum propeller
• Oversized anti ventilation plate
• Designed for heavy applications
• Manual start, no battery needed
• 20 inch long shaft
• Digital CD ignition with spark advance
• Stainless steel water pump housing
• Zinc coated water passages, saltwater rated
• Sacrificial zinc anodes and trim tab
• Tiller integrated forward, neutral and reverse
• Twist grip throttle with tension control
• Thermostat controlled cooling
• Auto ratchet trim (5 positions) and shallow water drive
• Quiet through prop hub exhaust
• 3.2 gallon fuel tank and line
• Start in gear protection, low oil pressure warning, ESG over rev protection
• Mercury Marine 3 year warranty

Mercury 9.9 HP 9.9MLH-CT outboard motor specifications

For the manufacturer’s own overview of the range, see Mercury’s FourStroke outboards page. Mercury updates details between model years, so if one spec really matters to your purchase, ask us and we’ll confirm it on the exact unit we ship.

Maintaining the Mercury 9.9 HP 9.9MLH-CT outboard motor

Fuel: fresh 87 octane, up to 10% ethanol; run the carb dry before long breaks.

Oil: about 800 ml of 10W-30; check before each trip, change at 20 hours then every 100 hours or yearly.

Gear case: change the Command Thrust gear lube yearly.

Cooling: check the telltale every start; flush after saltwater use.

If you’re newer to boating, the US Coast Guard boating safety site is worth a read. It’s written for US boaters, but the advice on kill cords, life jackets, fuel handling and navigation rules applies wherever you are in the world.

What Command Thrust actually does

Command Thrust is Mercury’s name for a heavier duty lower unit fitted to some small and mid size outboards. On the Mercury 9.9 HP 9.9MLH-CT outboard motor it brings three changes. First, a bigger gearcase with a lower 2.42:1 gear ratio, so the propeller turns slower but with much more torque. Second, a larger 4 blade high thrust propeller, around 20% bigger than the standard prop, which grabs more water. Third, an oversized anti ventilation plate and a taller gearcase that put the prop deeper below the turbulent water at the stern, so it keeps its grip.

The result is a motor that pushes heavy, wide boats with far more authority, holds a steady low trolling speed, stops and reverses more positively, and copes better when the stern pitches in a swell. You give up a little top speed on light boats, which is why Command Thrust models are aimed at sailboats, pontoons, heavier jon boats and kicker use rather than light planing skiffs.

Kicker motor basics

A kicker is a small outboard mounted beside a boat’s main engine, mainly for trolling. Big engines are built to run fast, and many can’t idle down slowly enough for trolling. Running them at idle for hours also isn’t kind to them. A kicker like the Mercury 9.9 HP 9.9MLH-CT outboard motor trolls all day at a steady low speed, burns a fraction of the fuel and saves hours on the main engine.

It also doubles as a get home motor. If the main engine fails, a kicker will bring a mid size fishing boat back to the ramp slowly but surely. For anglers who fish big lakes or open water, that backup alone is reason enough to fit one.

Most kickers are mounted on a dedicated kicker bracket, which lifts the motor clear of the water when you’re running on the main engine. A connector bar can link the kicker’s steering to the main engine, so you steer from the helm while trolling.

Using your motor through the seasons

In spring, check the oil, fit fresh fuel, look over the fuel line and connectors for cracks, and run the engine on a flushing attachment or in a test tank before the first real trip. Look for a strong cooling stream and a smooth idle.

Through summer, the main jobs are fresh fuel, regular oil checks and rinsing after saltwater use. Keep an eye on the propeller for dings. A damaged prop costs you speed and fuel, and can cause vibration.

In autumn, before the boat is laid up, do the full storage routine: flush, change the oil and gear lube, deal with the fuel system as the owner’s manual describes, grease the moving parts and store the Mercury 9.9 HP 9.9MLH-CT outboard motor somewhere dry. Twenty minutes in autumn saves hours of frustration in spring.

Paperwork, warranty and keeping records

When your Mercury 9.9 HP 9.9MLH-CT outboard motor arrives, write down the serial number and keep it with your invoice. Take a photo of the serial plate on your phone too. If you ever need warranty work, a dealer will ask for both, and it makes the process much quicker. The Mercury factory warranty starts from the date of purchase, so hang on to that paperwork.

It is also worth keeping a simple log: date, engine hours if you have them, oil changes, gear lube changes, impeller replacements and anything unusual you noticed. It takes seconds after each service, and it adds real value if you ever sell the boat. Buyers pay more for an engine with a clear service history, and it helps any mechanic you work with understand the motor quickly.

Check your boat insurance as well. Many policies have specific requirements for outboard security, such as a lock on the clamps or bracket, and some ask for the serial number. Better to sort that out on day one than find out after a problem.

Why buy from us

We deal in outboard motors every day, and we would rather give you a straight answer than make a quick sale. If you are not sure the Mercury 9.9 HP 9.9MLH-CT outboard motor is the right motor for your boat, message us with the make, model and length of the boat, how you use it and where you boat. We will tell you honestly whether it is a good match or whether something else would suit you better.

Every motor is packed carefully for the journey, and we keep you updated from dispatch to delivery with tracking. We ship worldwide, and we are happy to explain in advance what to expect with import duties and local taxes in your country, so there are no surprises when it arrives.

After you buy, we are still here. If you have questions about setup, break in or maintenance, just ask.

A small spares kit worth carrying

You do not need a workshop on board, but a few cheap parts turn most breakdowns into a ten minute fix. For the Mercury 9.9 HP 9.9MLH-CT outboard motor, we suggest a spare spark plug and the right spanner, spare propeller hardware, a spare kill cord, a small bottle of engine oil, a couple of fuses if the motor has electrics, and a fuel line O ring or connector seal. Add some cable ties, a roll of self amalgamating tape and a basic multi tool.

Pack it all in a small dry bag, keep it in the boat, and check it every spring. Most owners never need it. The ones who do are very glad it was there.

A quick checklist before every trip

It sounds obvious, but most days that go wrong on the water start with something small that got missed at the dock. Before you head out with your Mercury 9.9 HP 9.9MLH-CT outboard motor, run through this in your head:

• Enough fresh fuel for the trip, plus a sensible margin
• Engine oil checked and at the right level
• Motor mounted securely and everything tight
• Kill cord clipped to you, not left on the tiller or dash
• Cooling telltale spraying water once the engine is running
• Life jackets, a way to call for help, and a small spares kit aboard

It takes a minute or two. It is also the habit that separates relaxed boat owners from the ones waiting for a tow.

More questions we get asked

Can I install the Mercury 9.9 HP 9.9MLH-CT outboard motor myself?

Many owners do, following the owner’s manual. If you are not confident with mounting, rigging or electrics, a local marine mechanic can set it up quickly, and it is money well spent.

How often does it need servicing?

Check the oil before every trip. Change the engine oil and gear lube at least once a year, or at the hour intervals in the owner’s manual, whichever comes first. Inspect the water pump impeller regularly and replace it as recommended.

What fuel should I use?

Fresh unleaded petrol of the octane rating shown in the specifications, with no more than 10% ethanol, unless it is a propane model. Old fuel is the cause of most running problems.

Can I pay in instalments?

Payment options vary by country. Contact us and we will tell you what is available for your order.

Why fuel care matters so much

If there’s one thing that decides whether an outboard starts first time or leaves you pulling and swearing at the ramp, it’s fuel. Modern petrol, especially with ethanol blended in, starts to break down within weeks. It absorbs moisture, separates and leaves gummy deposits that block the tiny passages in fuel systems.

For your Mercury 9.9 HP 9.9MLH-CT outboard motor, the rules are simple. Buy fresh fuel from a busy station. Don’t store it for months in a can. Keep the tank vent closed when the boat isn’t in use. Use a fuel stabiliser if the boat will sit for more than a few weeks. And before any long lay up, deal with the fuel system as the owner’s manual describes, rather than leaving old fuel inside the engine. It’s a few minutes of effort that saves a lot of cost and frustration.

Real world setups for the Mercury 9.9 HP 9.9MLH-CT outboard motor

The budget minded sailor

A 22 foot trailer sailer that needs proper push into a breeze but doesn’t need electric start. The Mercury 9.9 HP 9.9MLH-CT outboard motor gives real Command Thrust grip at a lower price, and there’s no battery wiring to run to the bracket.

The pontoon on a small lake

A 16 foot pontoon used for evening cruises. The 4 blade prop moves the boat smoothly and quietly, and the tiller makes it easy to handle near the dock.

The work punt

A heavy aluminum punt used around moorings or fish pens, often loaded with gear. It needs grunt at low speed, not top speed, and a pull start motor that just works. This one fits the bill.

Setting up

Lift it with help, centre it on the transom or bracket, tighten both clamp screws firmly by hand and tie a safety line to the boat. Set the trim so it runs close to vertical. Connect and prime the fuel line, check the oil, clip on the lanyard, put it in neutral, set the choke and pull. Check the cooling telltale, vary the throttle for the first couple of hours and change the oil at 20 hours.

Alternatives to the Mercury 9.9 HP 9.9MLH-CT outboard motor

9.9ELH-CT: electric start and charging.

9.9ELHPT-CT-PK ProKicker: adds electric start, power tilt and a heavy duty bracket.

9.9MLH: standard gearcase for lighter boats.

See the full range in our Mercury 9.9 HP section and main Mercury outboard motors category.

Mercury 9.9 HP 9.9MLH-CT outboard motor for sale: price and worldwide shipping

The current price of the Mercury 9.9 HP 9.9MLH-CT outboard motor is shown at the top of this page. You can add it to your cart and check out straight away, or if you’d rather talk to a person first, send us a message through our contact page and we’ll come back to you with a full delivered price to your country.

What you get

• Mercury 9.9 HP 9.9MLH-CT outboard motor, new
• 3.2 gallon fuel tank and quick connect fuel line
• 4 blade high thrust propeller, fitted
• Owner's manual
• Mercury Marine 3 year factory warranty from the date of purchase

Shipping worldwide

We ship to buyers all over the world. Every motor is packed securely for the journey and sent by courier, freight or sea depending on its size and where you are, with tracking from dispatch to delivery. Import duty and local taxes depend on your country, and we’re happy to explain what to expect before you pay so there are no surprises.

Buying with confidence

Have a read of our refund and return policy, see what other boat owners have said on our customer reviews page, and find out more about who we are on the about page.

Mercury 9.9 HP 9.9MLH-CT outboard motor FAQ

What does CT mean on the Mercury 9.9 HP 9.9MLH-CT outboard motor?

Command Thrust: a heavier gearcase, lower gear ratio and 4 blade high thrust prop.

Does it need a battery?

No, it’s pull start.

How heavy is it?

About 96 pounds.

Is it new?

Yes, with the full Mercury factory warranty.

Do you ship worldwide?

Yes. Contact us for a delivered quote.

Order your Mercury 9.9 HP 9.9MLH-CT outboard motor

Command Thrust pulling power at a manual start price. Add the Mercury 9.9 HP 9.9MLH-CT outboard motor to your cart now, or send us a question first. You can also compare it with the rest of our outboard motors for sale.