He is putting tape on the flywheel intake, its an F engine so he is cutting down the air flow to the air vane causing the high RPM and that is cutting down the cooling airflow to cool the engine. So we have long grass causing a high engine load , high RPM with no load and cut down cooling air , this guy is killing that engine !!!
If this engine has an air-operated governor, he is defeating it by blocking the airflow to it. That also is blocking the cooling air. Engine runs faster, gets little to no cooling air.
James is an ______.
You beat me to it! I was typing while you posted...oh well.