Spark plug gap

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Spark plug gauge
Spark plug gauge, used to measure and set the spark plug gap

Also known as plug gap or spark plug gap.

The gap refers to the distance between the center electrode (dark rod) and the top ground electrode (hook-like part) on a spark plug. To ensure optimal performance, it is important to make sure the spark plug is gapped to the specifications recommended by the moped's manufacturer. Usually this information is listed in the manual.

The gap is measured and set using a spark plug gauge, available at any auto parts store.