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

1 Answers
SanAna
07/29/25 3:15pm
When adjusting the air-fuel mixture, first ensure there are no leaks in the intake manifold, the valve clearance is within the standard range, and there are no air leaks. Start the vehicle and let it warm up for a few minutes. Turn the mixture screw all the way in, being careful not to apply excessive force, then unscrew it approximately 1.5 turns and start the engine. Slightly tighten the idle screw inward to adjust the idle speed to above 1500 RPM for a stable idle. If the idle speed exceeds this position, slowly adjust the mixture screw back to find the point where the engine speed was highest. Use a small flathead screwdriver to slowly rotate the air mixture screw outward, repeating the adjustment steps to find the optimal position.
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