Gotta get timing spot on, 1.5 - 2mm btdc. Did you use the timing light? I would also oil the felt pad and put a dab of grease on the trailing arm of the points. If it suddendly runs wo you knowing then its something loose... Check all connections for cleanliness and tightness and grounds as well, always suggested to add another ground wire from your coil mount to one of the cylinder studs.