I remember well going down the highway on my '65 BSA 650 Lightning flat out, chin on the gas cap.
A friend of my brother's had recently purchased a new 1966 X6 250 Suzuki Hustler and he went by me ..... looked just like the back end of that Yamaha with 2 streams of smoke in my face.
Don't think I found religion but I did get a glimpse of the future in that moment .....
I had a 250 Suzuki XJ Hustler (think I got that right)... last bike I ever owned. Still have dreams about finding it in a garage somewhere and firing it up. You never forget that 2 cycle sound. Never really wanted anything larger.