I don’t really know. We never found one that needed reseting. Earl Tweinig (Chief Field service Engineer for Champion) gave us the spark plugs we used for racing. They furnished plugs to almost every one engaged in high performance motor sports. Earl told me if I went to Indianapolis for there 500 mile race, he would get me into the pits to help him change spark plugs in the race cars. Unfortunately that was a busy time of the year for the outboard business, so I never took him up on it. . . 🙂
