Honda did a more than a few strange things when it comes to wiring. Most confusing thing is that they changed color codes over the years. Main wires have stayed the same colors but the component colors have changed. A number of different colored wires in the same circuit. They added diodes, clutch and side stand switches; more fuses, ignition relays and IMO other un needed stuff.
I use a number of different wiring diagrams to determine what is what. (80-81 Twinstar service manual, 85-87 CMX, 96-09 CMX color diagrams.)
I've decided to use a Rebel wiring harness for my modification. This will make it easier to connect the hand controls for one thing. I've removed most of what I call the un needed wires. Twinstar only has one coil, so more wires to get rid off. Neutral light had a number of different colored wires, it's been narrowed down to one. The ignition switch (key) is causing some head aches, Rebel had far to many "things" for the ignition. It's going to take some re wiring for this switch.
Sub harness for the rear lights is basically the same, so I can leave that alone.
Yes, there will be some that say the un needed components are safety systems. They maybe a good idea for novice riders, but I don't like them. I know to put my bike in neutral and engage the clutch when starting the bike. Can't say I've ever taken off with the kick stand down..
1980 Twinstar CM200T