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Now perhaps I'm completely off base but my understanding with the "ignition" is that in fact each engine has two ignitors, a left and a right and that this switch is not for selecting which engine to start but which ignitor to use. And of course there's a position to have both ignitors on for start or hazardous flying conditions. Please correct me if I'm wrong as I would like to have the correct idea.
You are right. The normal recommended practice as I've read it is to use Left and Right alternately on each startup. I flip it over after shutdown at the end of each flight so the other circuit gets used next time. This is to ensure that both are working -- you'd soon determine when there was a fault. As you say, you would only use the "both" position in hazardous restart conditions where you really needed to be sure -- if you used it regularly you'd never detect a failure in one of them.