I've previously posted about my rectifier with no luck so here goes hoping someone can help me identify my bike.

Engine is NC23.
Frame is NC31-1101042

From what I've read I can see NC31-1000001 to 1034643 is the CB400F2N,
NC31-1200001 to 1212250 is CB400F2R.

If my frame number is in between then what the hell is my model...

Hello!
If you are not yet found an answer, maybe you can write the number of the engine and put a picture of your motorcycle. I will try to help you find out the direct model name.