Here is a Fairbanks Morse Type R magneto. This mag makes a very hot spark. No wear can be felt. It turns over fine. One of the mounting ears may have been ground down a bit but that will not hurt a thing. Please take a look at the pictures and decide if you need it. If you want to talk about it 419 789 1159. Please note,,, there are lots of different kinds of FM Z engines! If you are not sure if this part will go on your engine please send me some pics of your engine and I will let you know. Only very minimal or no wear can be felt. Turns smoothly just as it should. Mounts with 2 holes about 3-7/8 apart on center. For Questions 419 789 1159. I think I list items very accurately but my opinion on condition may differ from yours. I have not had most of these mags apart and may not know what the inside looks like. If you want advice on how to use it please give me a call and I’ll be glad to help. Please do not be a clown and tear it all apart and then complain about something. Thanks for looking at this listing! If you want to check out my reputation and such please feel free to google search my name. My name and address is. 14316 State Route 281. If you can find a way to talk to me with your voice you will almost always get a quick response. If you message me please try not to sound like a caveman. I have terrible grammar myself so I understand but sometimes it is very difficult to comprehend what some people write. If I make a mistake on my measurements or you feel something is not as described please let me know and I will try to make it right. I think most all of my customers with a normal level of sanity are happy. I think most people would agree that I do an extremely good job of packing items so I guess it’s worth the wait. Check out my other items. Be sure to add me to your favorites list.