It makes perfect sense to me also. These engines are not DA 50's designed from the start to be run on CDI ignition. Just look at any ad for a CDI ignition engine. They give the weight and a picture of the engine. It almost never includes the ignition unit in the pic or in the weight. They just show a sleek engine with no mag, flywheel or anything. They have everyone thinking that an engine with magneto ignition is not worth putting on a plane. Most people do not know a magneto is able to retard and advance the timing as much as a CDI setup. Plus I hate waiting for batteries to charge. The last thing I want is another battery to go dead. Also from what I have been reading. Magneto ignition with a resistor plug causes far less raido interference than a CDI setup. I know the Futaba 127DF has trouble with CDI ignition and interference. Magneto ignition keeps everything up front on the engine where it belongs, away from the radio gear. Plus how many times have you heard of a magneto going bad. Not often. Look here on RCU and you will find tons of posts about CDI ignition problems. Simpler is always more reliable. My computer screws up constantly. My calculator never does