What Does The Choke On An Outboard Motor Do?

Outboard motors are used for propelling and navigating boats. They usually have a self-contained unit that includes the engine, gearbox, and propeller or jet drive. How does the choke on outboard motor work? What is its function? Is it really important? These are the questions you are asking. Now let’s put some answers on them!

What The Choke On An Outboard Motor Does?

The outboard motor uses a choke when it works by internal combustion. The choke can be adjusted to regulate the amount of fuel entering the carburetor. The choke is used to close off the inlet to the carburetors. When you crank the engine, the amount of fuel entering the carburetor is increased while the amount of air entering is reduced. This change in the amount of fuel in the fuel and air mixture enables the engine to start up.

What Is The Importance Of The Choke?

The choke is very important in an outboard motor working by internal combustion. Gasoline does not vaporize efficiently when cold. So without the choke, the engine may not start up when it is cold. The way around this is to activate the choke to increase the amount of fuel in the combustion chamber. By this, the choke helps the engine start.

How Does an Outboard Choke Work?

First of all, the choke needs to be activated. The choke can be activated by a knob, button, or through a pull handle. When the choke is activated, its solenoid, a coil will expand and restrict the area through which air enters the carburetor. With the restriction, the amount of air entering the carburetor will be reduced. Simultaneously, the pressure on the carburetor reduces, letting in more fuel to the combustion chamber and the engine starts up.

How to Choke an Outboard Motor

An outboard motor is designed to start easily, like your car. But sometimes carbureted, the two can be difficult to start, especially when it’s cold. In times like this, you have to know how to choke your outboard motor. This is achievable in a few steps:

Firstly, you should tilt your engine at an angle that allows fuel to get to the carburetor faster. Downward is better.

Secondly, you should squeeze the primer bulb till firm.

Thirdly, you should advance the throttle in neutral to ⅔’s

Next is to turn the key and push to choke – or pull out the stroke as the car may be – and crank the engine at the same time.

After this, you can release the choke and take the throttle back to neutral after ignition.

Also, make sure the tank is well vented. If your outboard features a built-in tank, ensure there’s no obstruction like wax or accumulated debris.


The choke is an important feature of an outboard motor using internal combustion. It regulates the quantity of fuel and air in the carburetor when it is activated. The choke can be activated by a button, a knob, or through a pull handle.

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