Basic Electrical System Maintenance .
First : Adjust the magneto coils . They should be as close to the flywheel magnets as possible without touching . Your feeler gauge set probably has a brass feeler , use that or a business card , matchbook cover , maybe even a slice of plastic milk container for a spacer . Loosen the coil mount screws and press the coils outward to the magnets and tighten the screws and remove the spacers .
Second : Pull all electrical connections , including all ground points , switch contacts and bulb bases and sockets . Insure every one is bare metal shiny clean and scratch tight while reattaching .