I do have a 1981 NOS HS50 that I bought a new in box powersport throttle assembly for. I also have an NOS Taylor "S" pipe (bare steel ready for chrome or high temp coating) spark arrestor for it with the short directional tail pipe. If you are interested PM me to discuss a price shipped to your door, it won't be cheap but it's perfect for a nice minibike build and they are getting though to find. I will never use it given the bike it was to go on was sold and it's too nice or too small for my other stuff.