Because the concentration of the mixture is controlled by the idling oil needle when the engine is idling

 

The vacuum at the main nozzle of the throat and the idle nozzle disappears, fuel is no longer sprayed, and the fuel is replenished to make the oil chamber pressure equal to the atmospheric pressure when the diaphragm is in a balanced position. The pressure valve is closed to start enrichment. It is required to supply a relatively rich mixture when starting. Therefore, it is necessary to press the start enrichment lever before starting to open the pressure regulating valve. The fuel flows into the fuel chamber under the action of gravity and overflows from the nozzle. Enrichment.

When starting, you can also close the small air door to increase the degree of each nozzle to enhance the fuel suction effect, supply excess fuel, and thus play the role of enrichment. The damper should be opened immediately after starting, otherwise the engine will stall due to the excessively rich mixture. The adjustment of the carburetor will directly affect the starting idle speed and acceleration power and fuel consumption of the engine.

The factory’s wind power extinguisher has been adjusted. After the carburetor is cleaned and maintained, the oil needle of the Sichuan vacuum pump should be adjusted to the original position, the specific adjustment method. When the engine is idling, the concentration of the mixture is controlled by the idling oil needle. When screwing in to become thinner, the speed increases, and when screwing out to become rich, the speed decreases. It is adjusted until the engine can run stably at idling speed, and it can also be smooth when accelerating. Increase the throttle of the transition, the engine does not stall until it stops.

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