Editing Reading spark plugs (section)
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===Example plug=== [[File:Example plug.jpg]] *'''1''' is a timing indicator, you'll see a definite color change on the ground strap right about at the arrow. Too much timing and the color change will be very close to the body of the plug, too little timing and it'll be closer to the tip. Ideally it'll be right at the 90 degree bend on the ground strap, in this image timing and temperature look good. *'''2''' indicates the base timing is ideal. *'''3''' shows another timing indicator; usually there's a brown ring right at the tip of the porcelain. It should be a sharp defined ring about 0.020" wide. A wider ring indicates not enough timing. If the ring is smaller, incomplete or nonexistent (like shown here), that could indicate too much timing. *'''4''' is a heat range indicator seen at the threaded portion of the plug. Looking at the threads you'll see that a few toward the end are a dull burnt looking color, and the rest are black and shiny. You want about 2 threads showing the heat on the end of the plug and the rest of the threads to be shiny. If you're using a longer reach plug, 2.5 to 3 threads is optimum. Too few colored threads indicates a too-cold plug; too many colored threads indicates a too-hot heat range.
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