20 1 1 familia III engine what is the reason for idling fire?

After the engine is started, it runs well from low speed to high speed, but stop immediately after releasing the accelerator pedal. Or unstable operation first, and then shut down. This phenomenon can be judged as idle flameout fault.

When the idle speed is turned off, the idle speed should be adjusted according to the actual situation (if the cause of the fault is clear, it can also be repaired directly). After adjustment, if the fault disappears, it is improper adjustment of idle screw; If the fault does not disappear after adjustment, open the throttle to keep the engine running, and check the carburetor and intake pipe gasket for air leakage with cotton yarn or paper. If there is no air leakage, the idle metering hole can be removed for inspection, and the idle oil circuit can be blown clean before reassembling and testing; If the fault disappears, the idle metering hole and idle oil passage are blocked. For carburetor with idle stop valve, check whether the circuit of cutting off electromagnetic coil is normal. If the idle fuel-saving metering hole is blocked due to abnormal coil circuit, the cut-off solenoid valve should be repaired.