I sent you a PM.
It is common for Cub magneto coils to go bad, or partly quit, like you described in your 1st post on page 1 of this post.
People have said on here the engine runs bad, or stops after 20 or 30 minutes of use.
Then the engine runs again when it is cold.
But the condenser can cause a similar problem.
You could do a spark strength test when the engine quits, and see if the spark is normal or small.
The spark should be blue or white, and jump a 1/4" gap.
Below is a listing at TM Tractor for a new coil, it is under the cover on top of the magneto, you can look at the pics.
http://www.tmtractor.com/new/el/713fp.htm
The coil originally has a rectangular bar through it, for the mounting. Save it and use it in the new coil.
Below is their listing for points and condenser.
http://www.tmtractor.com/new/el/367fp.htm
