Trouble phenomenon: The repairman reflected: “A 125 type scooter (GY6 engine), the engine is difficult to start in cold state, and the operation is not stable within a few minutes after starting work, but the engine is in good working condition and easy to start. Repeated inspection, The cylinder is sealed and compressed well; the spark plug electrode has good flashover; the fuel passage is unblocked; the cleaning carburetor is invalid; the ignition coil, igniter, ignition charging coil and pulse trigger coil are also invalid; the engine oil is replaced, from the spark plug hole A small amount of lubricant is injected into the cylinder and it is still invalid. How can I not find the cause of the malfunction?"
Fault analysis and elimination: According to the analysis of the phenomenon of the car by the repairman and the characteristics of the electric heating automatic start-up enrichment device on the car carburetor, the reason for the failure of the car is that the engine is automatically activated when the engine is cold. The needle valve of the enrichment device cannot be opened, so that the combustible mixture cannot be enriched, and it cannot be adapted to the cold start of the engine. There is no fault in other parts. The reason is that the engine is in good working condition and easy to start.
When the carburetor was removed, it was found that the needle valve of the electrothermal automatic start enrichment device could not be opened due to the stuck state. Eliminate the card lag, the engine cold start is easy, the idle speed works smoothly, the acceleration response is sensitive, and the fault is eliminated.
It is worth noting that when the power line of the electrothermal automatic start-up enrichment device is disconnected, the engine is started and works well in the cold state. However, when the engine is hot, the mixture is too rich and the work is poor, it is difficult to start, and it is difficult to start.
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