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My lawn mower won't start

You've got a yard full of grass that that should have been cut last week only to find that your lawn mower won't start. Instead of giving up and letting the grass take over, allow Repair Clinic to help you get your yard back on track. There are many reasons that can stop your lawn mower from starting. You may need new spark plugs or a new carburetor. Or, the fuel in the mower may be old. Regardless of why your lawn mower isn't starting, Repair Clinic is here to help troubleshoot and diagnose the issue. We also have repair videos that give you step-by-step directions and the necessary replacement parts. Your DIY fix will not only save you money but return your lawn to the neat green oasis you're used to.
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Common solutions for: Lawn mower won't start
Solution 1:
Spark Plug
Inspect the spark plug for signs of wear or damage. If the porcelain insulator is cracked, an electrode is burned away or damaged, or there is heavy carbon buildup at the electrode, replace the spark ...plug. To determine if the spark plug is defective, use a spark plug tester. You should see a strong spark between the tester’s terminals when the engine is cranking. If there is no spark, this indicates that the spark plug is defective and should be replaced.
Required Part
Lawn Mower Spark Plug
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Solution 2:
Carburetor
The carburetor might be clogged. A clogged carburetor is most commonly caused by leaving fuel in the lawn mower for a long period of time. Over time, some of the ingredients in the fuel may evaporate,... leaving behind a thicker, stickier substance. This sticky fuel can clog up the carburetor and prevent the engine from starting. If the carburetor is clogged, try cleaning it with carburetor cleaner. If cleaning the carburetor isn’t effective, rebuild or replace the entire carburetor.
Required Part
Lawn Mower Carburetor
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Solution 3:
Carburetor Repair Kit
The carburetor might be clogged. A clogged carburetor is most commonly caused by leaving fuel in the lawn mower for a long period of time. Over time, some of the ingredients in the fuel may evaporate,... leaving behind a thicker, stickier substance. This sticky fuel can clog up the carburetor and prevent the engine from starting. If the carburetor is clogged, try cleaning it with carburetor cleaner. If cleaning the carburetor isn’t effective, rebuild or replace the entire carburetor.
Required Part
Lawn Mower Carburetor Repair Kit
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Solution 4:
Old or Bad Gasoline
There may be old or bad fuel in the carburetor float bowl. Over time, some of the ingredients in the fuel may evaporate, leaving behind a thicker, stickier substance. This sticky fuel can clog up the carburetor and prevent the engine from starting. If the carburetor is clogged, try cleaning it with carburetor cleaner. If cleaning the carburetor isn’t effective, rebuild or replace the entire carburetor.
Solution 5:
Fuel Pump
The fuel pump has three ports: the gas in port, the gas out port, and the pulse port. The pulse port is connected to the engine crankcase by a small rubber tube. As the engine runs, air inside the cra...nkcase alternately pressurizes and depressurizes the air in the tube. This pressurized air moves a diaphragm inside the pump and pumps the gas. If the engine oil is overfilled, oil can enter the pulse port line, preventing it from working properly. The fuel pump also has two small check valves on the input and output ports. The check valves prevent fuel from reentering the gas tank. These check valves can fail. To determine if the fuel pump is defective, check the pulse port line, check valves, and the diaphragm inside the pump. The fuel pump is not repairable—if the fuel pump is not working properly, you must replace it.
Required Part
Lawn Mower Fuel Pump
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Solution 6:
Start Switch
To determine if the start switch is defective, use a multimeter to test it for continuity....
Required Part
Lawn Mower Start Switch
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