> It starts, but when I hit the throttle, it dies.
Let it warm up before you give it throttle. Also, do you know if your fuel/air mixture is proper to begin with? Does it die if you very gradually ease into the throttle? A friend's bike immediately dies if you try to give it any throttle until it has idled for like half a minute... maybe your's is temperamental like his. Your carb is clean, too, right? Check for air-leaks, too.
> The taillight is not working. I bought a new bulb
> about a week ago and then that bulb burnt out or
> most likely there's a problem with the wiring.
Look at the bulb and see if its filament is broken. If not, you'll have to trace the wires back through the frame to check for damage... get a multimeter and use it to test continuity, it's much easier than visual inspection. Make sure the bulb holder isn't corroded or grody, too. Also, some configurations regularly blow bulbs, so getting a proper voltage and wattage bulb is key.
"5 and 6" of what? There are like over half a dozen diagrams on that page. Look at the wires coming out of your engine... do you have 5 or 6 wires? If your bike is definitely 1980, chances are you'll have 6 wires, in which case you should be more closely inspecting the 6-wire diagram[s]
They're a little convoluted, especially with all the excessive wiring to the brake switches and the horn nonsense (supposedly a f***ed-up horn can cause no-spark issues too... look into that one as well), but relatively easy to deal with once you understand them.
The wires can be in any order, as long as what's on one side mates with what's on the other... ie; grey to grey, green to green, yellow to yellow, etc... also, the colors with a slash in the middle (blue/black, blue/green, are the ones that have two colors on the wire insulation). Study the diagram and your own wiring harness, build an understanding for what wire is for what; like grey is the running-light, yellow is the main headlight and some other shit, blue is to the ignition coil, brown is ground, blue-green is for the brake switches, etc etc
Why not just use the original site? Myron's has tons of great info
Good luck man :)