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Summary: Replace the old spark plug with a new one. Learn how to install a new spark plug in this free online instructional video.
" Hi! This is John on behalf of Expertvillage.com. In this video clip, we will be discussing how to reinstall the spark plug. When you reinstall the spark plug, you are going to want to put the spark plug back into the socket, but you’ll notice that I have it disconnected from the ratchet and the reason for this is that when we put the spark plug back we want to start it using our fingers, so that we don’t cross thread it. Once you know that it has started you can attach the ratchet and continue to tighten it, remember righty-tighty, lefty-loosey."
eHow Article: How to Install a Spark Plug