How do you set timing on Briggs and Stratton 20 horse power motor?

To set the timing on a Briggs and Stratton 20 horsepower motor, first ensure the engine is off and cool. Remove the spark plug and rotate the engine by hand until the piston is at top dead center (TDC) on the compression stroke. Align the timing mark on the flywheel with the mark on the engine casing. If necessary, adjust the ignition coil position to ensure the spark occurs just before TDC, typically around 25 degrees before TDC, depending on the specific model.