How do you tune up 4 hp Briggs and stratton?

To tune up a 4 HP Briggs and Stratton engine, start by changing the oil and replacing the oil filter if equipped. Next, clean or replace the air filter and spark plug to ensure optimal combustion. Check the fuel system for any debris and replace the fuel if it's old. Finally, inspect the carburetor and adjust the throttle and idle settings as needed for smooth operation.