What is the mechanical difference between a pilot fuel screw and a pilot air screw on a motorcycle carburetor, and how does turning them clockwise affect the idle mixture?

1. A pilot fuel screw regulates fuel flow (turning clockwise leans the mixture), while a pilot air screw regulates air flow (turning clockwise riches the mixture).
2. A pilot fuel screw is located on the air filter side of the carburetor, while a pilot air screw is located on the engine side.
3. Turning either screw clockwise will always lean the air-fuel mixture because both screws only restrict fuel.
4. A pilot air screw increases the fuel pump pressure, while a pilot fuel screw adjusts the float height.