Benagli 502 is short of cylinders.

Too much carbon deposit. The phenomenon that Benagli 502 lacks cylinders is that the car body shakes obviously when idling. The reason is that the throttle valve, nozzle and air intake have more carbon deposits, which leads to the blockage of the engine cylinder and needs to be cleaned. Lack of cylinders means that engine failure leads to insufficient power and a few cylinders do not work.