A fresh spark plug often provides the necessary jolt to get a dormant engine running. If this seal is broken, the engine will crank loudly but fail to start.
Quick Fixes for a Lawnmower Engine Not Starting
If the spark plug is fouled, damaged, or disconnected, the engine will crank indefinitely without firing. Even if the engine sputters, a clogged carburetor will often prevent the machine from ever achieving the compression necessary to start.
Inspecting the Spark Plug Diagnosing ignition problems is straightforward and requires only a few tools. An engine requires three things to run: fuel, compression, and spark.
Checking the Spark Plug for Ignition Issues
A healthy spark plug should have a light tan color on the electrode; a black, sooty plug indicates a rich fuel mixture or oil leak, while a white, blistered plug suggests the engine is running too hot. If the gas in your tank looks cloudy or smells sour, it has gone bad and must be drained.
More About Why is my lawnmower not starting
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