NotTaR of small Gasoline Engines and Rotary Lawn Mowers : Checking the spark plug                 
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Checking the spark plug

Use the proper socket to remove the spark plug and inspect it for damage and general appearance:

The best thing to do at this point is just replace it with a new spark plug and worry about the old one later. Actually, nearly every small engine maintenance book will recommend changing the spark plug every season anyhow.