Before using or cleaning your mower, follow these safety tips: Do not smoke while fueling lawn mowers. Gasoline is explosive. Wait for machines to cool before refueling. Wipe up spilled fuel immediately. Never fuel a running mower. Store and pour gasoline carefully and keep it in an approved container with a tight fitting lid. Check electric mower cords for frayed or damaged spots. Frayed insulation added to a metal mower, damp or wet grass, can cause lethal shocks or severe electrical burns. Leave blade sharpening and electric repairs to professionals. If you do your own cleaning and tune-up, disconnect the spark plug or remove it before beginning. If a blade is turned by hand, the mower can start if the spark plug is still intact. Never leave the mower without turning it off. It takes only a few seconds to run inside and only a few seconds for the mower to run over someone and cause serious injury. Never disable the automatic shut off lever or device. Always use hearing protection while mower is running.