Stale Gas and the Carburetor Old fuel is the single most common cause of a hard-starting engine. Inspecting the Spark Plug Diagnosing ignition problems is straightforward and requires only a few tools.
Troubleshooting Fuel System Problems in Your Lawnmower
First, disconnect the spark plug wire and remove the plug. If you pull the starter cord and notice a distinct lack of resistance, or if the engine backfires through the carburetor, you likely have a valve or ring issue.
Few tasks are as frustrating as pulling the starter on your lawnmower and hearing nothing but a dull click. This seal is maintained by the piston rings and the head gasket.
Troubleshooting Stale Gas and Carburetor Problems
If this seal is broken, the engine will crank loudly but fail to start. Recoil Starter and Pull Cord A loss of compression is often audible.
More About Why is my lawnmower not starting
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