ORIGINAL: normgoyer
The magnetos are the heart of the engine. When ever you have any problem with the key/switch or a drop below safe rpm during runup on either mag or the engine does not stop firing immediately when the mag is switched to "off" have it fixed like NOW.
The magnetos themselves have always been fine. Its just when doing the run up check, sometimes the switch get stuck in the 'off' position for a second nearly turning off the engine. I'm trying to find out why in particular its bad for the engine to be stopped using the mags.