Small Engines (Lawn Mowers, etc.): Lawn boy mower, air gap, sandpaper

Question
I have an OLD Lawn Boy mower( about 1985 model). It is a 2 stroke and I love it to cut grass on my hillside. It quit running and I found it had no spark. I removed the ignition coil and cleaned everything. I measured the gap and rest to that when I reassembled. It ran fine for a day. The next day it quit again. I took the coil back off to make sure no wires came off or screws loose. Nothing. I reassembled and it ran. The next time I went to use it, about a week later, it wouldn't run again. I am lost, Please help. Is the coil gonig bad and shaking it makes it work ? I'm lost. Thanks!!!

Answer
Yes you will after some time so I would suggest replacing it when you put the new one on set the air gap the thickness of a business card or a photograph whichever hand.  If you haven't replaced the spark plug at the same time.  I would also remove the flywheel inspect the key and clean the magnet surfaces off with a little very fine sandpaper or Emory cloth if you have it.  Just enough to take any corrosion off also do the posts that the CD pack mounts to.  This should take care of your problem if not please get back to us best of luck.