What factor affects how the governor should be adjusted on lawn mowers?

The adjustment of the governor on lawn mowers is primarily influenced by the length of the blade. A longer blade requires the engine to maintain a certain speed to ensure effective cutting and performance. If the blade is too long, it can create excessive load on the engine, causing it to bog down. The governor helps to regulate the engine speed to compensate for this load by adjusting the throttle position accordingly. Properly adjusting the governor in relation to the blade length ensures that the engine can maintain optimal performance without stalling or losing power during operation.

Other factors, such as engine power, fuel type, and oil viscosity, may impact overall engine performance and efficiency, but they do not directly dictate the specific adjustments needed for the governor related to blade length. Engine power is more about the capability of the engine itself, fuel type focuses on combustion efficiency, and oil viscosity relates to lubrication rather than the specific operational mechanics of the governor concerning blade length.