1. Prepare Tools and Supplies:
- Phillips screwdriver
- Flat-head screwdriver
- Wire brush
- Carburetor cleaner spray
- Disposable gloves
- Safety glasses
- Clean rag
2. Locate Carburetor:
- Disconnect spark plug wire and move it away to prevent accidental starting.
- The carburetor is usually located near the top of the engine. It has a fuel line connected to it.
3. Remove Air Filter:
- Remove the air filter cover and set it aside.
4. Disconnect Fuel Line:
- Use a pair of pliers to disconnect the fuel line from the carburetor.
5. Remove Carburetor:
- Use a Phillips screwdriver to remove the screws holding the carburetor to the engine.
- Be careful not to drop the screws or any small parts.
6. Disassemble Carburetor:
- Place the carburetor on a clean surface.
- Use a flat-head screwdriver to remove the float bowl screws.
- Remove the float bowl and float.
- Remove the carburetor jets and gaskets.
7. Clean Carburetor Parts:
- Spray carburetor cleaner into the carburetor body, jets, and passages.
- Use a wire brush to scrub off any visible dirt or debris.
- Be sure to clean the pilot jet and main jet thoroughly.
8. Reassemble Carburetor:
- Replace the carburetor jets and gaskets.
- Install the float bowl and float.
- Tighten the float bowl screws.
9. Reinstall Carburetor:
- Reposition the carburetor onto the engine.
- Replace the screws that hold the carburetor in place.
- Tighten the screws securely.
10. Reconnect Fuel Line:
- Reattach the fuel line to the carburetor.
11. Test the Lawn Mower:
- Reconnect the spark plug wire and move it back into place.
- Start the lawn mower and let it run for a few minutes.
- If it runs smoothly, the carburetor cleaning was successful.
12. Maintain Carburetor:
- Clean the carburetor periodically, especially if you use the lawnmower frequently.
- Regularly check for dirt and debris around the carburetor and air filter.
- Use fuel stabilizer in the gasoline to prevent the carburetor from getting clogged.
By following these steps, you can clean the carburetor on a 3.5 hp Briggs and Stratton carburetor for a self-propelled Yardmaster lawnmower.
