I have 2001 Vespa ET4 (150cc).
I have a question concerning AF (A/F Air Fuel) mixture screw.
As I turn this clockwise and screw it more tightly into the carburetor body, does this make the scooter run more rich or more lean?
Please let me know from your concrete experiences instead of random guesses. Some motorcycle AF screw controls fuel flow and some controls air flow.
Thanks a lot,