What is throttle dirt? Is it soot in the air or soot in the crankcase?

This is mainly because the oil and gas in the combustion chamber evaporates after flameout, returns to the position behind the throttle, and then adheres to the intake pipe wall.

Then, after you start, the dust enters the intake pipe, and when the flow speed is slow, it will adhere to the engine oil, and after a long time, it will become sludge.

It becomes carbon deposit after high temperature.

You see, carbon deposits are behind the throttle, especially when idling, which is more likely to produce sludge.

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