How to improve the idle speed of classic Mazda 3

1. First, adjust the throttle screw of the carburetor clockwise and counterclockwise (crosshead screw on the right front side of the carburetor). Adjust the engine speed slightly higher than the normal idle speed, and then turn the idle oil concentration adjustment screw (copper screw with prefix on the left side of carburetor, clockwise downward and counterclockwise upward). ), find out the highest speed of the engine at this throttle position.

2. Secondly, slightly adjust the throttle screw counterclockwise to reduce the engine speed; Then adjust the idle oil concentration adjustment screw to find a higher engine speed.

3. Then repeat the method of "throttle down+idle oil up" several times until the maximum speed of the throttle valve is equal to the standard idle speed of the whole vehicle when it is adjusted to a certain position.