How to adjust the mixture ratio of a scooter carburetor?

[LaCayden]

Mixture ratio, also known as the "air-fuel ratio," refers to the proportion of air to fuel. When describing concentration, it is best to use terms like "rich" or "lean" for the fuel-air mixture. If referring to "high" or "low," it specifically indicates the A/F ratio, which is the "air-fuel ratio." Therefore, when the fuel-air mixture is "rich," there is more fuel and less air, resulting in a "low" A/F ratio. Conversely, when the mixture is "lean," there is less fuel and more air, leading to a "high" A/F ratio. Below are the detailed steps for adjusting the carburetor on a scooter: 1. First, prop up the vehicle. Turn the air-fuel adjustment screw clockwise until it stops, then back it off by 1/2 turn. 2. Rotate the idle screw clockwise until the spring beneath it is compressed (ideally around 4000 rpm). 3. Start the engine; the RPM will be high.