How do you adjust the valves on a 4 cycle engine?

To adjust the valves on a 4-cycle engine, first ensure the engine is cool and disconnect the battery. Remove the valve cover to access the rocker arms and valve lifters. Rotate the engine to the proper position (usually top dead center) for the cylinder you are adjusting, then use a feeler gauge to measure the gap between the rocker arm and the valve stem. Adjust the gap by turning the adjustment screw or nut until the desired clearance is achieved, and reassemble the components once all valves are adjusted.