Welcome to OldMiniBikes. :thumbsup:
The 97cc engines really aren't worth much. Some guys buy them to tinker on, but they don't pay alot. If you want to sell it, just got to the Classified section here on OldMiniBikes, go under Minibike Parts, and then create a thread posting it for sale. If somebody is interested they will either respond to the thread and PM you.
Also, in the future, the classified section isn't for posting threads asking questions.