Why can't the throttle of Benda 250 carburetor be controlled?

This problem is caused by improper adjustment of mixing ratio screw, high oil level and poor sealing of triangular needle valve. This happens after cleaning the carburetor, and the most common reason is the fault caused by the high oil level of the carburetor. You can disassemble the carburetor and reassemble it, focusing on checking whether the oil float is stuck and the sealing and position of the triangular needle valve. After adjusting the mixing ratio screw to the end, turn it out for 2.5 turns, and adjust the air intake control screw to be slightly larger than the normal idle speed. In this way, after starting the car and waiting for the engine to warm up, it is only necessary to readjust the mixing ratio screw and the idle speed screw, and make fine adjustments with the adjustment range of 1/4 volume, so as to adjust the engine to the idle speed of 1200 rpm. The carburetor should be cleaned every two years or every 65,438+0,000 kilometers. Cleaning the carburetor requires replacing the gasoline filter element.