How do you set the valve timing on a 11.5 Briggs and stratton motorWhat is the setting for inlet and exhaust valves and how do i adjust the centre screw so the whole thing doesnt move?

To set the valve timing on an 11.5 Briggs and Stratton motor, first ensure the piston is at top dead center (TDC) on the compression stroke. The inlet valve should typically open at around 15 degrees before TDC and close at around 35 degrees after BDC, while the exhaust valve opens at about 35 degrees after BDC and closes at around 15 degrees after TDC. To adjust the center screw and prevent movement, hold the valve adjusting screw steady with a wrench while tightening the lock nut to secure it in place. Always refer to the specific model's service manual for precise specifications and settings.