Read over these real good. Knowledge is power with that carb. As soon as you understand how it works it's easier to troubleshoot and tune for optimal performance. The dog scooter manual is a necessity to have and it has valve udjustment. Also search YouTube for Chinese scooter valve adjustment.
http://www.chinesescooterreference.c...otermanual.pdf
http://www.chinesescooterreference.c...Carburetor.pdf