Abstract: The present invention is a tool free quick change spark plug mechanism. It includes a head insert, a spark plug and a locking housing. The head insert has a threaded base to be inserted into a spark plug port of an internal combustion engine. It is generally cylindrical and hollow, and has either a locking groove or an extended locking mechanism on its outside wall above the threaded base. The plug is generally cylindrical and elongated with an electrode for sparking and a terminal for a wire attachment, and has a seal with a greater diameter than the lower end of the plug for seating within the head insert. The locking housing is hollow and cylindrical to fit over the spark plug and head insert, and has on its inside wall, the other of the locking groove and extended locking mechanism.