Messing with carb tune, oops!

[99owned]

Was messing around with the air/fuel screw (right next to intake)
and i took my scoot out or a ride, and it just lost power, seems like if i tweak it, it will get better, but still can't find the right setting, does it really effect it this much?

[jlee]

Turn it in small increments, waiting 10-15 seconds between each movement, until you obtain maximum engine RPM. Then back it off 1/8 turn and re-adjust your idle speed setting until the rear wheel just stops spinning.