The green dye used to make the insulation on those wires caused the rubber to break down faster than the other wires hence the problem with the green wire. I just replaced one yesterday. It's a bit of a pain but not that hard. Get a nylon fish tape from Harbor Freight, remove the gas tank, push the tape from the headset down through the body, attach a new 16 gauge wire to it and pull it back up. Install new fuel and oil lines while the tank is out.
I run 90/90 10's on all my P's. The fatter tire is close but does not rub. Not sure about those tires your running. I've never been a fan of white walls myself but you cant go wrong with a set of tires from a reputable manufacturer.
Replace the swing arm bushings. It's not that hard on a 200. I like the urethane ones from http://www.claussstudios.com/id52.html
I also really like the shocks from YSS. Inexpensive and good quality. I'm a big guy and ride on terrible roads, the YSS shocks have lasted much longer than other brands for me.
Beautiful looking P by the way.