Locate the Spark Plug. The location of the spark plug will vary depending on your specific Generac generator model.Refer to your owner's manual for detailed instructions. Typically, you'll find the spark plug on the top of the engine, near the cylinder head. It may be covered by a spark plug boot or a protective cap.. Remove the Old Spark Plug. Save money by servicing your Generac stand-by generator yourself. It's easy, takes very few tools and less that 15 minutes.
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Otherwise, replace the spark plug. 5. Inspect the spark plug gap using a wire feeler gauge. Replace the spark plug if the gap is out of specification. Engine information is found in the Specifications section of the generator's user manual. Note: New spark plugs should have spark plug gaps checked prior to installation. 6.. The information should be published there. Once you got the correct socket, you need to attach it onto your spark plug by your hand. If it's properly seated on the spark plug, you can attach the ratchet. Add an extension if needed. Our recommendation is to use the ratchet only to make the spark plug loose and then remove it.