In article ,
says...


Just running down the list in my head, I am going to take the opposite
position. Most aircraft have BOTH mags with an impulse; a small minority
have only one with an impulse.




Well, I certainly can't contest that, but Lycoming did issue a service
instruction some years ago, indicating that motors with two impulse coupled
magnetos should have the right one replaced with a plain magneto.
Implementation at owner's discretion.