An obstruction in the fuel feed is the most typical cause of a surging lawn mower engine, although there are additional possibilities: It smells like bad gas. A faulty spark plug. Carburetor that is dirty or malfunctioning.
Everything about the engine
An obstruction in the fuel feed is the most typical cause of a surging lawn mower engine, although there are additional possibilities: It smells like bad gas. A faulty spark plug. Carburetor that is dirty or malfunctioning.