The Compression Conundrum When fuel and spark are confirmed to be in working order, the issue usually lies in the mechanical compression of the engine. 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.
Diagnosing Low Compression in Your Lawnmower
This chemical process is the primary reason a mower sits idle through the winter and then fails to roar back to life in the spring. Recoil Starter and Pull Cord A loss of compression is often audible.
Stale Gas and the Carburetor Old fuel is the single most common cause of a hard-starting engine. Regularly running the tank dry or using a fuel stabilizer are the best preventative measures a homeowner can take.
Diagnosing Low Compression in Your Lawnmower Engine
If the spark plug is fouled, damaged, or disconnected, the engine will crank indefinitely without firing. Over time, the ethanol in gasoline absorbs moisture and separates, creating a layer of varnish that can clog the carburetor.
More About Why is my lawnmower not starting
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