How to rebuild lawn mower carburetor?

How to rebuild lawn mower carburetor?


Rebuilding a lawn mower carburetor is a task that may seem daunting at first, but with the right knowledge and tools, it can be a relatively straightforward process. A lawn mower carburetor is responsible for mixing air and fuel to create a combustible mixture that powers the engine. Over time, carburetors can become clogged or worn out, leading to poor engine performance. In this article, we will guide you through the steps to rebuild a lawn mower carburetor, ensuring that your mower runs smoothly and efficiently.

Gather the necessary tools and materials

Before diving into the carburetor rebuilding process, it is essential to gather the required tools and materials. Here are some common items you will need:

Materials used:
– Carburetor rebuild kit (specific to your lawn mower’s make and model)
– Carburetor cleaner
– Compressed air
– Safety glasses
– Gloves

Tools required:
– Screwdrivers (flathead and Phillips)
– Pliers
– Small wire brush
– Small container for soaking parts
– Shop towels or rags

Remove the carburetor from the lawn mower

To rebuild the carburetor, you first need to remove it from the lawn mower. Here are the general steps to follow:

1. Disconnect the spark plug wire to prevent accidental engine start.
2. Locate the carburetor on your lawn mower. It is usually attached to the engine and has fuel lines connected to it.
3. Take a picture or make a note of the fuel line connections to ensure proper reassembly later.
4. Disconnect the fuel lines and any other attachments securing the carburetor to the engine.
5. Carefully remove the carburetor, taking note of any gaskets or seals that may come off with it.

Disassemble the carburetor

With the carburetor removed, it’s time to disassemble it for cleaning and inspection. Follow these steps:

1. Place the carburetor on a clean work surface and remove any external screws or bolts holding it together.
2. Gently separate the carburetor’s main body from the float bowl, taking care not to damage any gaskets or seals.
3. Remove the float and needle valve assembly, noting their orientation for reassembly.
4. Take out any other removable parts, such as jets or mixture screws, and keep them organized for cleaning.

Clean and inspect the carburetor components

Cleaning the carburetor components is crucial to remove any dirt, debris, or varnish that may be causing poor performance. Here’s how to do it:

1. Soak the carburetor parts in a suitable carburetor cleaner according to the manufacturer’s instructions.
2. Use a small wire brush to scrub away any stubborn deposits.
3. Rinse the parts with clean water and blow them dry with compressed air.
4. Inspect each component for signs of wear or damage. Replace any parts that are excessively worn or no longer functioning correctly.

Reassemble the carburetor

Once the carburetor components are clean and inspected, it’s time to reassemble them. Follow these steps:

1. Begin by reattaching any jets, mixture screws, or other removable parts that were removed during cleaning.
2. Install the float and needle valve assembly, ensuring proper orientation.
3. Carefully place the carburetor’s main body back onto the float bowl, aligning any gaskets or seals.
4. Reattach any external screws or bolts that hold the carburetor together.

Reinstall the carburetor onto the lawn mower

With the carburetor rebuilt, it’s time to reinstall it onto the lawn mower. Follow these steps:

1. Align the carburetor with the mounting holes on the engine.
2. Reconnect the fuel lines and any other attachments that were disconnected earlier.
3. Double-check that all connections are secure and properly tightened.
4. Reconnect the spark plug wire.


Rebuilding a lawn mower carburetor is a task that can significantly improve the performance of your mower. By following the steps outlined in this article, you can ensure that your carburetor is clean, properly assembled, and ready to provide optimal fuel and air mixture for your lawn mower’s engine.

Remember, it is essential to consult your lawn mower’s manual or seek professional assistance if you are unsure about any specific details or if your mower requires a different procedure.