STEP 1: DISCONNECT THE SPARK PLUG
Before beginning work, disconnect the spark plug wire. Since most small engines run with no outside power sources(like a battery), they can start unexpectedly as they are being worked on. To ensure that this does not happen, you should ground the disconnected spark plug wire by fastening it to the engine block. On many engines, a grounding stub will be located near the spark plug wire.
STEP 2: DRAIN ALL FLUIDS
Drain all fluids from the engine. To drain the gasoline, disconnect the fuel line, remove the filler cap on the fuel tank, and turn the engine upside down so that fuel can run into a secure container. To remove the engine oil, take out the oil drain plug, and drain the oil into an approved container. Remember to follow appropriate disposal procedures.
STEP 3: CLEAN THE ENGINE EXTERIOR
Once the fluids have been drained, the engine should be cleaned. Cleaning an engine prior to disassembly makes it easier to locate fasteners, and also to remove them. To clean the exterior a de-greaser and a simple rinse with water can be used but I suggest avoiding the cylinder head because that is where most of the electrical components tend to be and is sensitive to water.
STEP 4: REMOVE THE SPARK PLUG
Always use a spark plug socket to remove the plug. Using a plug socket instead of some alternative implement will prevent damage to the plug insulator. Fit the socket over the spark plug terminal, and loosen it until the plug can be removed by hand.
STEP 5: REMOVE THE AIR FILTER
To remove the air cleaner, you will probably need to remove the cover on the air cleaner housing. After this been accomplished, remove the air cleaner filter element. In this engine, it is a paper mesh. Without the filament in the way, the fasteners securing the main air cleaner housing can be accessed. Screws attach
