I know, this is an ancient thread, but as this is the very best I found, I must bump it! CHRIS MARTENS's second post (also thanks to Paul Wurms) with the ignition timings is priceless. Checking the data is very informative and answers every questions one could have with EZL adjusting. It is very helpful for members without the EZL knob, but also for those who have a knob. In this later case it's clear that only the 260E (M103) engine is the one could gain from EZL adjusting, turning the dial into the "1" position. All other engines are at the maximum timing retard with the factory S setting. His post also clears up that the increasing numbers on the dial DO NOT mean less or more advance timing. They simply correspond to different values, therefore checking and understanding this data before one makes any modification to the factory setting is crucial. Thank you very much once again, now, 8 years later.