What steps should I follow to change the spark plug?
Every 100 hours or sooner check and replace the spark plug if electrode is burned/worn. Ensure it’s clean with gap at .020 in (0.51 mm). Use Briggs & Stratton Spark Tester (part number 19368) to verify functionality before reinstallation (Pages 17-18).
From the official Briggs And Stratton 500 Series manual, page 17
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