Motorcycle mixing ratio adjustment

The adjustment method can be carried out according to the following steps:

1. First, check the connection tightness of the connectors related to the carburetor to ensure that the carburetor sucks air normally without air leakage or blockage.

2. Turn the carburetor mixing ratio screw clockwise to the end, and then turn it counterclockwise by 1.5 turn.

3, start the engine, let the engine warm up 10 minutes, make the engine reach the normal working temperature.

4. Adjust the carburetor idle speed adjustment screw to make the engine run at the lowest speed and keep the engine running.

5, repeatedly adjust the carburetor mixing ratio screw, make the engine speed reach the highest. In this process, some friends will find that after adjusting the mixing ratio screw to a certain position and then rotating the mixing ratio screw counterclockwise, the idle speed will not change again. At this time, the mixing ratio screw can stay at the position where the idle speed has just been adjusted to the maximum.

6. Repeat steps 4 and 5 to make the engine run smoothly at idle speed.

7. Turn the throttle handle quickly, refuel violently, and then release the throttle. During this process, observe whether the acceleration and deceleration of the engine are stable. If it is stable, the adjustment is successful. If it is unstable, repeat steps 4 to 6 until the acceleration and deceleration of the engine are stable.

8. When the engine is idling, it should be kept for 5 minutes. After idle speed adjustment, some vehicles may have low idle speed. At this time, the idle speed should be slightly increased and kept at around 1000- 1500 rpm. Because the idle speed is too low, the engine may stall at high idle speed, because the air pressure at the air inlet decreases at high speed, which affects the gasoline supply at the carburetor idle nozzle.

9. In the process of idle speed adjustment, if there is gas emission from the exhaust pipe during emergency refueling, the mixture is generally too rich. The carburetor mixing ratio screw can be rotated counterclockwise. If there is a flameout or fire failure during emergency refueling, the mixture is generally too thin, just turn the carburetor mixing ratio screw clockwise. After the carburetor is adjusted, a road test of about 1.5km can be carried out. After the road test, remove the spark plug and observe the color of the ceramic under the center electrode of the spark plug. If it is brick red, it is normal; If it is white, the mixture is thin; If it is black, it is rich.