My first bike was a 1975 Yamaha RD200. 2-stroke, twin. Amazing power band.
This isn't mine but it's identical:
Next was a 1977 Yamah XS 400 that I cafe'd with drop bars, a quarter fairing and exhaust tips. Need to find some pics of that one as it was pre-digital. I got hit on it and it was totaled.
Here's how it looked stock (again, not mine but identical).