Plastic Carburetor, Repair It For FREE. Craftsman Push Lawn Mower with Briggs and Stratton Engine

Introduction

This tutorial will guide you through the process of repairing a plastic carburetor on a Craftsman push lawn mower equipped with a Briggs and Stratton engine. If your mower won't start, this step-by-step guide will help you diagnose and fix carburetor issues, check for spark, and ensure everything is functioning properly.

Step 1: Check for Spark

1. Remove the Spark Plug: Use a wrench to take out the spark plug.
2. Inspect the Spark Plug: Look for moisture; if it's wet, it could indicate a spark issue or fuel problem.
3. Test for Spark:
   • Reconnect the spark plug and ground it against the engine.
   • Pull the starter cord and watch for a spark. A good spark is blue and bright.

Step 2: Access the Carburetor

1. Remove the Air Filter: Unscrew the air filter cover to access the carburetor.
2. Unscrew the Carburetor Bolts: Use a socket wrench to remove the three 8mm bolts securing the carburetor.
3. Disconnect the Fuel Line:
   • Gently twist and pull the fuel line off the carburetor.
   • Expect some fuel spillage, so have a rag ready.

Step 3: Inspect and Clean the Carburetor

1. Examine the Choke: Ensure the choke is closed when the engine is cold. Check for dirt or blockage.
2. Remove the Carburetor: Tilt the carburetor and slide it off its mounts.
3. Disassemble the Carburetor:
   • Use a screwdriver to remove the two 7mm bolts from the carburetor.
   • Carefully take out the float and needle.

Step 4: Clean the Carburetor Parts

1. Inspect for Dirt: Look for any debris or clogs in the carburetor body and jets.
2. Use a Cleaner: Apply carb cleaner or brake cleaner into the jets and passages.
3. Clear Blockages: Use a small wire to clean out any tiny holes and ensure they are clear.
4. Reassemble the Carburetor: Put the float and needle back, ensuring they are seated correctly.

Step 5: Reinstall the Carburetor

1. Line Up the Carburetor: Place the carburetor back onto the engine, ensuring the linkage connects properly.
2. Reconnect the Fuel Line: Push the fuel line back onto the inlet and secure it with a clamp.
3. Reattach the Air Filter: Screw the air filter cover back on securely.

Step 6: Check Fuel and Start the Engine

1. Inspect the Fuel Tank: Drain any old fuel and replace it with fresh gasoline.
2. Reconnect the Spark Plug: Screw the spark plug back in place.
3. Start the Engine:
   • Pull the starter cord and see if the engine starts.
   • If it doesn’t start, recheck all connections and ensure the choke is functioning.

Conclusion

By following these steps, you should be able to diagnose and repair your plastic carburetor problem effectively. If the mower still doesn't start, consider checking for other issues such as the ignition coil or fuel quality. Regular maintenance and cleaning can prevent future carburetor problems. Happy mowing!