spark-plug
121plug cable separator — See spark plug cable separator …
122plug condition — See spark plug condition …
123plug electrode — See spark plug electrode …
124plug gap — See spark plug gap …
125plug gapping — Adjusting the side electrode on a spark plug to provide the proper air gap between it and the center electrode …
126plug gauge — See spark plug gauge …
127plug insert tap — See spark plug insert tap …
128plug insulator — See spark plug insulator …