Ultralights, it is easy to build a carby to automatically adjust mixture but with manual mixture control and a good EGT gauge, far more accurate adjustments can be made from on board. You may well want an engine that dumbs down everything but I don't. Tell me, how do you run LOP with auto mixture? Sure, magneto technology is old, but it sure is simple and in some ways I would prefer it to a bunch of electronic black boxes.
As a final note, have you ever seen just how easy it is to prop start an aircraft engine? My O360 will start with a barely perceptible movement of the prop. It is stunning to see just how easy it can be to start under the right circumstances. Using the mixture to stop the engine provides a margin of safety over and above ignition switches.
Last edited by Aussie Bob; 28th Jul 2013 at 05:18.