Welcome to the HQ !! Check that all grounds are clean and tight. Same with all connections and switches. Presume new wires with coil?
List up all your mods and settings (pipes, filter,jetting, etc) How do plugs look?
On my son's shee I had to clean rust off poles on stator, inside of flywheel, and lugs on outside of flywheel, set pick-up gap, to get rid of one cyl miss.