How to install the oil needle of motorcycle carburetor

When installing the carburetor, first put the throttle line through the upper cover of the carburetor, then put the spring around the throttle line, then extend the throttle line through the hole (the pipe you mentioned) of the throttle valve, pull it out from the next slot to the end, and loosen the head of the throttle line from the Mekong River slot at the bottom of the throttle valve. When installing the throttle valve into the carburetor, pay attention to point the throttle valve toward the idle screw with a slight inclination. Extend a long slot to the bottom, toward the convex side of the carburetor, and then screw on the cover. At this time, you can see that the throttle valve has dropped from the throat of the carburetor to the bottom, indicating that it is installed correctly. Please refer to the figure below.

Extended data

There are many kinds of motorcycles. Although the methods of replacing the throttle line are different, they are basically the same. When replacing the throttle pipe, first remove the throttle handle sleeve and carburetor upper cover (without vacuum membrane), compress the throttle and spring, remove the throttle pipe from the throttle, then pull out the old throttle pipe, and then replace the new throttle pipe according to the original route. The plunger of carburetor has one direction. If it is a plunger carburetor, there is a long groove on it. When installing, aim it at a protruding pin in the carburetor or point it at an inclined plane at the bottom of the throttle in the direction of the idle screw. If it is a vacuum membrane carburetor, the installation direction can be judged according to the shape of the vacuum membrane and the top of the carburetor. After installing the throttle pipe, adjust the screw on the pipe to adjust the free stroke of the throttle to within 5 mm. Then start the engine and turn the handlebar left and right. Just check whether the throttle line is installed correctly and there is no danger of being scratched by other things.