Hey, before I build a bike I was wondering about the laws here in SD, how old do you need to be to drive one, or is it any age, when is qualified as a moped? I am not old enough to drive yet but I really want a motorbike. Most everything i have seen says it doesn't matter how old you are but I need to know officially, there aren't a lot of cops in my area (maybe 3) and I have seen 2-3 people riding motorbikes and they didn't have a license plate on them or anything, also, can you really not have a 2-stroke? All of the bikes I have seen are 2-strokes. Thanks for your help! Josh.