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!
Gas flow is not adjustable. What is adjusted is the spring tension on the governor spring on top of the carburetor. You have to remove the air cleaner to get to the linkage and spring, then with engine running pull on the springs to see which one raises the speed. Then add tension to this spring, usually done by bending the bracket the spring is attached to. Bend in very small increments, until you get speed you like.
The spring to the right would raise the speed.
I see question is still open. Did you get speed to increase?