So with nothing to do to the bike mechanically, I turned my attention to the electrical system. When the MB came to me the wiring harness had been butchered. There were frayed wires where the ignition switch, ignition coil, battery, and left-hand switch cluster should have been. I found suitable substitutes for everything at Sudco International; a universal switch cluster (for an enduro bike), a reproduction ignition switch for a CB750, and a Nology hi-voltage ignition coil. I'd already picked up a replacement battery from Bikemaster, so all that was left to do was spend an evening at the kitchen table with an ohm meter and soldering iron. Thanks to a little guidance from Sport Rider's Andrew Trevitt (he has an Electrical Engineering degree, so he's a lot better at reading electric schematics than me) everything came together perfectly, and when I clicked the key to the "on" position a light on the dash winked on. The MBs nervous system has been restored, and I've seen the first sign of life!