Symptoms: The repairman reported: “A 125-type scooter (GY6 engine), the engine is hard to start in cold state, and the operation is not smooth within a few minutes after starting the engine, but the engine hot state works well and is easy to start. Repeatedly check, Cylinder seal and compression well; spark plug spark good between electrodes; fuel passage is smooth; cleaning carburetor is invalid; try to change the ignition coil, igniter, ignition charging coil, pulse trigger coil is also invalid; replace engine oil, from the spark plug hole A small amount of oil is injected into the cylinder and it is still ineffective.
Fault analysis and elimination: According to the repairman's reflection of the phenomenon of the car and the characteristics of the “electric heating type automatic start and enrichment device†set on the car carburetor, it is considered that the cause of the car fault is “electrical automatic start 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 adapt to the cold start requirement of the engine. There is no failure in other parts.†The reason is that the engine hot works well and starts easily.
The removal of the carburetor check revealed that the needle valve of the electrothermal autostart enrichment device could not be opened due to stuck. Eliminating its card lag, the engine is easy to start in a cold state, the idle speed is stable, and the acceleration response is quick and troubleshooting is eliminated.
It is worth noting that when the power line of the electrothermal type autostart enrichment device is disconnected, the engine is started and works well when it is cold. However, the engine is hot and the engine is in poor condition due to the mixture being too rich, making it difficult to start and difficult to start.
Fault analysis and elimination: According to the repairman's reflection of the phenomenon of the car and the characteristics of the “electric heating type automatic start and enrichment device†set on the car carburetor, it is considered that the cause of the car fault is “electrical automatic start 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 adapt to the cold start requirement of the engine. There is no failure in other parts.†The reason is that the engine hot works well and starts easily.
The removal of the carburetor check revealed that the needle valve of the electrothermal autostart enrichment device could not be opened due to stuck. Eliminating its card lag, the engine is easy to start in a cold state, the idle speed is stable, and the acceleration response is quick and troubleshooting is eliminated.
It is worth noting that when the power line of the electrothermal type autostart enrichment device is disconnected, the engine is started and works well when it is cold. However, the engine is hot and the engine is in poor condition due to the mixture being too rich, making it difficult to start and difficult to start.
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