Spark plugs that haven't been changed for a long time can become one with the cylinder head. Fortunately, it's possible to repair damaged threads instead of scrapping the head. (Photograph by Chris ...

There's something oddly satisfying about pulling an old spark plug out of an engine, but what do you do with the plug once it's out? Maybe you're having second thoughts about changing the spark plug ...

Almost every lawn mower owner has experienced the frustration of pulling the starter cord repeatedly only to have it sputter — or even worse, not start at all. While fuel issues, a dirty carburetor, ...