How To Change A Carburetor On A Push Mower

Introduction

Changing the carburetor on a push mower can significantly improve its performance and extend its lifespan. This tutorial will guide you through the steps necessary to replace the carburetor on an MTD 139cc engine mower. With just a few common tools, you can complete this easy DIY task and get your mower running smoothly again.

Step 1: Gather Necessary Tools and Materials

Before starting the replacement, make sure you have the following tools and materials ready:

• New carburetor (specific to MTD 139cc engine)
• Screwdriver set (flathead and Phillips)
• Wrench set
• Pliers
• Fuel line clamps or hose clamps
• Clean cloth or rag
• Safety goggles and gloves

Practical Tip

Always wear safety goggles and gloves to protect yourself from fuel and other debris.

Step 2: Prepare the Mower

• Ensure Safety: Disconnect the spark plug wire to prevent accidental ignition.
• Drain Fuel: Empty the fuel tank to avoid spills. You can siphon the fuel or run the mower until the tank is empty.

Step 3: Remove the Old Carburetor

• Locate the Carburetor: The carburetor is usually located on the side of the engine.
• Disconnect Fuel Lines: Use pliers to loosen the clamps and carefully remove the fuel lines from the carburetor.
• Unscrew the Carburetor: Use the appropriate screwdriver or wrench to remove the screws or bolts holding the carburetor in place.
• Take Out the Carburetor: Gently pull the carburetor away from the engine.

Common Pitfall

Be careful not to damage the mounting surface on the engine when removing the carburetor.

Step 4: Install the New Carburetor

• Position the New Carburetor: Align the new carburetor with the mounting surface.
• Secure the Carburetor: Use screws or bolts to fasten the carburetor securely in place.
• Reconnect Fuel Lines: Attach the fuel lines to the new carburetor and tighten the clamps.

Step 5: Reassemble the Mower

• Reconnect Spark Plug: Attach the spark plug wire back to its terminal.
• Refill Fuel: Pour fresh fuel into the tank.

Step 6: Start the Mower

• Test the Mower: Start the mower and let it run for a few minutes to ensure everything is functioning properly.
• Check for Leaks: Observe the carburetor area for any signs of fuel leaks.

Conclusion

Changing the carburetor on your push mower can enhance its performance and reliability. By following these steps, you can confidently tackle this DIY project. If you encounter issues during the process, consult the mower’s manual or seek professional assistance. Regular maintenance, including cleaning or replacing the carburetor, can ensure your mower runs efficiently for years to come.