How do you adjust valves 17.5 Briggs and stratton engine C-707?

Hi, Generally, get the hood out of the way, remove the four bolts holding the rocker arm cover on(3/8" socket.) Loosen the lock screw in the center of the pivot(could be a Torx or Allen) and rotate the engine clockwise( as viewed downward toward the flywheel screen.) The spark plug should have been removed and something loosely placed in the hole to observe the movement of the piston. When the piston goes past the top and moves 1/4" down, then adjust the valves to 0.005"(note: this should be at the time when both valves are closed and it may take multiple revolutions to be sure of the correct time as the valves will be "rocking - one closing as the other opens every other revolution.) Lock the adjustments down and reassemble.