Originally Posted by Finfan
You can also clean the spark gap with a piece of emery cloth or sandpaper. You should also get a feeler gauge so you can set the gap. Available at almost all hardware and auto parts stores. Of course the correct gap setting will vary depending on who you ask. It is one of those things where just about everybody will have a different opinion.
I use a piece of .032" stainless safety wire to gap plugs. Lots of that scattered around and motor runs better with slightly bigger gap than recommended.