Increased unreasonable external stress. For example, the brakes caused by a vehicle brake failure are too tight. At this point, external influencing factors should first be determined. Eliminate the influence of external factors and determine the internal causes.Incorrect installation and adjustment of the accelerator pedal and connecting rod. Due to improper installation and adjustment of the throttle linkage, the regulator's load control lever cannot be moved to the full load position, which affects engine performance.A clogged fuel system increases fuel supply resistance and reduces fuel supply pressure. It often turns out that the fuel filter is clogged, causing the fuel supply to the fuel pump to become insufficient. The filter should be cleaned and replaced regularly as indicated in the operating instructions.