#1 Broken woodruff key. Retarded timing from the flywheel slipping. Fix: New woodruff key and some blue loctite.
#2 Weak Coil. Resistance from the spark plug killed the spark. Fix New coil.
#3 Bad Bearings. Caused the flywheel to walk into the coil, grounding it out. Fix: New bearings and seals.
Let me know if you guys like this and I will do more of these.