You can easliy and cheap fix the electrical problem with a Kohler rectifier. Google on 'Kohler recifier honda' and you'll find enough threads about guys working with it. Does a great job!
Cb200 has single coil, so when one plug fails, automaticly the other one does as well. Sure it's the cap? cb200 can NOT fire on one leg, when both plugs are checked OK and wires are on. (that is when carbs are ok ofcourse..)