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Here's Why Your Lawn Mower Won't Start And What To Do About It
Spark Plugs
If your mower is experiencing problems with the starter rope, power loss while running, increased gas usage, or an engine that turns over without starting, it could be a bad spark plug. Cleaning or replacing the plug is an effective initial solution for most starting issues, but it's still a good idea to replace it annually.
Plug Wires And Coil
Examine your plug wires and replace them if damaged; if the plug wires are in good shape, ensure they're making good contact with the spark plugs. Test the mower's on/off switch with an electrical tester or a multimeter set to continuity mode, inspect the coil control wire for abrasion, and, if necessary, replace the coil.
Lawn mower batteries can die easily and require regular maintenance, including cleaning the battery terminals and ensuring tight electrical connections. If the battery is in good condition, examine the alternator and starter, check wires for damage, and test the solenoid and starter switch if necessary.
Fuel Troubles
Ensure there is gas in the tank and check its age, as gas can deteriorate in as little as a month, causing clogs and damage to fuel lines and carburetors. It's best to store mowers without gas or with a fuel stabilizer, but if the mower does have old gas, you may need to remove and clean the fuel system components.
Fuel System
Regularly replace your fuel filter, especially if old gas is in your engine, and ensure the fuel pump is working and the gas cap hole isn't clogged. Lawn mowers have built-in aids like priming bulbs and chokes to ensure the right fuel/air mixture reaches the engine, so learn how to use these features effectively.