What are spark plugs and what are they for?
A#18:The spark plugs thread into the top center of the cylinder head in a 14mm hole, have a white porcelain top half, a threaded silver metal bottom half with a small metal ground strap on the center pointing to a ceramic center electrode with a small metal tip. They receive the high voltage electrical signal from the coil and produce a spark (imagine that) to ignite the intake charge and initiate the combustion process. More than anyone ever wanted to hear about spark plugs, but they are a vital part of the igntion system. For more information about how to read spark plugs, check out the Jetting FAQ. Otherwise just be content knowing that they oughta spark when you kick it over.
