Do you hear a click when you push the peddle down a ways? If not you have a problem with limit switch or wiring to or from it. Switch is located behind the key switch inside under seat. Take cover off and see if wires are on/loose. If not, check for voltage to one of the wires when key is on with volt meter. You should have 12 volts to one of the wires and be hearing a click when the switch is hit by the throttle cable. If you have power to switch but not click, then bad switch. If you do have a click, then follow voltage to where it isn't and is supposed to be for the prob.
Switchs are on Ebay and many other web sites and of course dealers at around $24.
If you do not have a manual then take the one below as it is the best and gives all need info on your repairs.
http://www.buggiesgonewild.com/attac...-gas-parts.pdf