The switch has no name on it. Its a gray 3X2" box that goes somewhere which I havent figured out yet.Looking at the swithch on the left side is 1 with the word(leaner) above it. The right side has the number 6 with the word (richer). Since I have moved the switch it has no rime or reason when it will start. The few time I have started it and move the swith it has made a difference on how it runs, but as soon as I give it gas it dies and its start all over. Thanks for your input Ron