Freaky I assumed from what you asked ,as that is how it reads!!!you were after a" Classic Speedway Solo," They have very strict rules no matter were you are in the world.. You Know like no brakes at all, weight limits ,seat size, mufflers, fuel,wheel sizes, no rear suspension, direct drive with clutch only, engine and carby configuration etc etc .
Dirt track "sliders" use what ever power plant and frame config you like.