Answer :
Final answer:
The rocker arm usually rides on the cam lobes and transfers motion to the rest of the valve train in a four-stroke internal combustion gasoline engine.
Explanation:
In a four-stroke internal combustion gasoline engine, the part that usually rides on the cam lobes and transfers motion to the rest of the valve train is the rocker arm.
The rocker arm connects the camshaft to the valve stem and acts as a lever to open and close the valves in sync with the engine's cycle. It converts the rotational motion of the camshaft into linear motion to control the valve operation.
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