How to Adjust the Air-Fuel Mixture on a Scooter Carburetor?

1 Answers
DeJulianna
07/29/25 9:37pm
Here are the steps to adjust the air-fuel mixture on a scooter carburetor: 1. Adjusting the screw: Turn the mixture screw all the way in, being careful not to apply too much force, then back it out by 1 and 1/4 turns. Start the engine and slightly tighten the idle screw, adjusting the idle speed to above 1500 RPM, but not excessively high. 2. Repeat the adjustment: Using a small flat-head screwdriver, slowly turn the air mixture screw outward. Listen to the engine sound—if the sound increases, it indicates the adjustment is in the right direction. Find the position where the engine speed is highest and stop adjusting the mixture screw. Then, turn the carburetor idle screw outward to set the idle speed to around 1500 RPM. Repeat the above steps to find the optimal position. If the engine speed decreases, becomes unstable, or stalls beyond this position, carefully readjust the mixture screw to return to the point where the engine speed was highest.
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