I spent a few months trying to figure out a similar problem on an old Harley Sportster a few years ago. After replacing the coil, wires, points etc. with no luck I found that one of the wires to the coil had an eye in the end that was crimped on. When the motor heated up that caused the crimped part of this eelet to expand just enough to break contact and kill the motor. After setting about 5 minutes it would fire right back up. Once I squeezed the wire a litle more, problem solved. Good luck...
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