How often do you clean the throttle and spark plug?

The throttle and spark plug should be cleaned every 20,000 kilometers. Throttle is a controllable valve to control air to enter the engine, and there are two kinds: traditional cable throttle and electronic throttle. Known as the throat of an automobile engine, it is connected with the air filter and the engine block. Spark plug, commonly known as burner, uses pulse high-voltage electric discharge from high-voltage line (burner line) to break through the air between the two electrodes of spark plug and produce electric spark to ignite the mixture in the cylinder. The main types of spark plugs are: quasi-spark plugs, edge protruding spark plugs, electrode spark plugs, seat spark plugs, pole spark plugs, surface jumping spark plugs and so on.