How to adjust the thousand speed of four-wheel drive tractor

1, first find the position of the adjusting screw with a screwdriver.

2. Secondly, adjust the throttle screw to keep the engine running at a certain speed without stalling.

3. Then adjust the air adjusting screw to make the engine speed as high as possible.

4. Finally, adjust the throttle screw to reduce the engine speed as much as possible.