Small Engine Troubleshooting Problems? Ask a Mechanic Now.
Welcome to JUST ANSWER small engines, let me try to help you !! I don't know it all, but maybe together we can get you a satisfactory answer!
No throttle, it should be preset , but has some sort of fine adjustment.
The throttle at carburetor would have a knob with spring, that you turn in or out to raise or lower speed. A gallon per hour is about right, just be sure choke is open and not making unit black smoke from too much fuel.