Excuse me, how to adjust the left screw of motorcycle carburetor? Is it thin or thick? How to distinguish the best effect?

There are different ways to adjust the mixing ratio screw of motorcycle carburetor. Generally speaking, the mixing of vacuum film and plunger carburetor used in vehicles above 125 is thicker than that of screw clockwise dilution and counterclockwise dilution, while the carburetor for small displacement horizontal cylinder vehicles is just the opposite, and it is diluted clockwise and counterclockwise.

Generally speaking, the carburetor has been adjusted to the best condition when it leaves the factory, so it is best not to adjust it at will. If you really need to adjust, you can first press the benchmark parameters of the carburetor. Generally, screw the mixture screw to the end, then withdraw it for one and a half turns to two and a half turns, then start the engine to warm up, and then adjust the idle speed, and then fine-tune the mixture screw until the idle speed is the highest, and then adjust the idle speed. To a certain extent, the mixing screw can be fine-tuned, and the idle speed will not change obviously, and it can be adjusted to the standard number of revolutions.

Carburetor is a mechanical device that mixes a certain proportion of gasoline with air under the vacuum generated by engine operation. As a precise mechanical device, carburetor uses the kinetic energy of inhaled airflow to atomize gasoline. Its important role in the engine can be called the "heart" of the engine. Its complete device should include starting device, idling device, medium load device, full load device and acceleration device. The carburetor will automatically match the corresponding concentration and output the corresponding amount of mixed gas according to the requirements of different working conditions of the engine. In order to mix the mixture evenly, the carburetor also has the function of atomizing fuel for the normal operation of the machine.