How do you use a plug gap chart?


Quick Answer

To use most spark plug gap charts, measure the space between a spark plug's center electrode and its ground electrode to ensure the actual gap matches that listed on the chart, and make adjustments as necessary. Automotive parts stores carry a gapping tool that provides accurate measurements.

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Full Answer

Spark plug gap charts reflect the ideal spacing for ignition under typical applications, and may not be appropriate for a particular use. Even factory pre-gapped spark plugs require measuring to ensure the spacing remains correct after shipping.

Narrow a too-wide gap by carefully tapping the plug's electrode on a hard surface. Widen the space using a gapping tool to pull up on the ground electrode without touching the center electrode or the porcelain. Avoid re-gapping multi-leg grounded plugs and racing plugs. Take special care with fine wire plugs, as the center electrodes easily snap, voiding any warranties.

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