Carburetor removal
- Drain the fuel, close the shutoff valve if any, or remove the gas tank. On the common Craftsman mowers, the tank either slips off or is fastened with a couple of screws. The gas line should pull right off. Inspect the fuel line for damage or cracking and replace it if these are severe.
- Remove the air filter, inspect, and set aside. The small plastic enclosed air filters twist off counterclockwise. If it is clogged and of the paper type, replacement will be needed. If it has a foam element, this can be reused if it doesn't fall apart. Remove the foam element, clean in soap or detergent and water, dry, and then coat it with a few drops of fresh engine oil. Work the foam with your fingers to distribute the oil. For other types, see your engine manual.
- Use a large philips screwdriver to loosen the two screws fastening the intake manifold to the cylinder block. If the gasket separates easily and cleanly, then it can be reused though a dab of non-hardening sealer is advisable once you have tested the mower to be sure that your newly restored carburetor is functioning properly. If it tears or is damaged in any way, then it should be replaced.
If the bolts are really tight, an open end wrench may be of help but common sockets may not fit around the bottom bolt. Thin walled sockets may work.
- Disconnect the throttle linkage and governor spring noting which holes they go in. IMPORTANT: If you get this screwed up you could have a runaway situation on your hands when you go to restart it. This can destroy the engine in a few seconds!
- Disconnect the rubber tube from the primer bulb, if any. It should pull off. If it tears near the end, there is probably enough slack so that a new tube is not required.
- Disconnect the speed control and stop switch wire, if any. Note how they are installed.
The carburetor can now be moved to the convenience of your workbench.
WARNING: there is still likely a significant amount of gas inside the float bowl. Initial disassembly at least should be done outside so that you can dispose of this safely. Working outside is advisable in any case as the common carburetor cleaning solvents are both flammable and bad for your health.