There are four holes under the throttle of the four-cylinder carburetor.

There are four holes under the throttle of the four-cylinder carburetor. The function of the hole is to let the mixture flow through the throttle and enter the engine combustion chamber. The design and location of the hole can affect the flow rate and injection mode of the mixture, thus affecting the performance and combustion efficiency of the engine. The number, shape and size of specific holes vary with different carburetor designs, and there will be multiple holes to achieve more accurate mixture control.