I have a current, up to date South Carolina drivers hand book in my hand right now. This is exactly, word for word what it says about mopeds.
A moped is a cycle with or without peddles and with a motor of not more than fifty cubic centimeters. It’s power will not exceed more than two brake horsepower and the motor is not capable of propelling the vehicle at a speed in excess of thirty miles an hour on level ground. The power drive system must directly or automatically without clutching or shifting after the engine is engaged.
The clause about thirty miles per hour is not an understand speed limit. It means the moped it’s self can not be capable of going over thirty miles per hour. Doesn’t mean your moped can do fifty, but you’re not supposed to exceed thirty miles per hour. Maximum speed on any kind of moped here it twenty five miles per hour period.
There is something in my hand book about lighting, including head, brake and turn signals and rear view mirrors. That’s another story though. My motorized bike is 100% legal here.
That being said, now I wonder if the shift kits for these bikes are legal, with or without a manual or centrifugal clutch. I don’t think it would be since you don’t “HAVE” to change gears.
Could not find anything in my book abut a tag, so I just called DMV. I was told as long as my moped meets the previously requirements that I just stated, I need no tag. There are a few stipulations about operator’s age, drivers license and safety equipment (helmets) in the book too.
I live on a major highway really close to a magistrates office and have cops around all the time, day and night. Never had a problem with them at all. Of course, my bike being 100% legal, I don’t expect to. Even if I ever do get pulled over, I’m sure it won’t be a big deal. I’ve been seen by them riding in the road and on the sidewalk.
My point is, do your homework about your local laws. If you choose to run illegal and get caught, don’t whine ! I know there are a lot of people on this forum that run illegal. Especially when it comes to engine size and maybe power, depending on how much these little engine actually produce. Hope this helps and answers your question !