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This carburetor is PD26/PD27 commonly used in 125/ 150 straddle-type motorcycles. The adjusting screw at the top of the figure is an idle screw, and the air mixing screw at the bottom. Tighten the mixed gas screw clockwise to dilute the mixed gas, and pull it out counterclockwise to increase the mixed gas. Generally, it is enough to screw the screw to the end and then exit it two times to the left. In addition to improper adjustment of the mixed gas screw, other factors such as air filter blockage, improper use of air door, too high oil level of carburetor, too high position of main oil needle and too large main metering hole are also related to excessive mixed gas. In addition, the dark color of spark plug is also related to many reasons, such as frequent low-speed short-distance driving, weak high voltage and so on. And the heavy smell at the tail is also related to fuel. Whether the automobile mixture is too thick depends on whether it is normal in normal use. If there is nothing unusual in use (such as starting, fuel consumption, power, sound, etc.). ), it is best not to adjust the mixing ratio easily.