Where is the throttle?
That also is a custom setup per owner. Some are manual throttles (meaning the operator raises and lowers) and are connected to the engine via a throttle cable. Most use aircraft throttle cable because of its flexibility and because it does not take much force to pull the inner cable through the outer cable. These manual throttles all have some type of manual throw. Mine is a brake lever, others use go-cart twist grips, 3-wheeler throttles, etc. Other types of throttles are electronic. Push a button and the throttle goes up and another button to make it goes down. The advantage to electronic throttle is that you can set the throttle and leave it. The advantage of the manual throttle is that you take your hand off the stick and the throttle returns to idle.