Keep an eye on the fuse holders and give them a little squeeze to tighten the connections. My bike went dead and it was the main fuse holder. The 20 amp one near the battery. Carry twice as many fuses as you think you need, carry a spare head and tail light bulb.
Check the wires where they exit the CDI, they wear against each other. I squirted a gob of silicone glue there.
Plug and unplug everything every 10K miles. I oil my connections, others use dielectric grease. Anything to stop corossion.
Tighten the plug cap connection.
Take your wiring diagram to the copy store and have it supersized, use the best paper or map paper.
Down load and print the electrical troubleshooting section of the factory repair manual.
Buy this Radio Shack multimeter, it's a good one and will do all the tests.