Will the diesel micro-tiller not increase the oil and be related to the valve?

According to the relevant data of the road network, the reasons why the diesel micro-tiller can't increase the throttle include: too much engine oil is added or the nose is too low, the engine oil enters the combustion chamber to increase the fuel supply, or the governor is faulty (such as stuck), which can't restrain the increase of the throttle, resulting in too high speed; So it's not about the valve.

The valve is responsible for inputting air into the engine and discharging exhaust gas after combustion. From the engine structure, it can be divided into intake valve and exhaust valve.