Good evening, I have a problem with my Jinan Quingqi QM-50QT-6A. The carburetor cannot be adjusted, I turn the mixture screw in (so too) then the speed rises. But if I turn it over 3 revolutions Out he just dies off. I don’t know what else to do, I have repeated it a few times and I don’t want to succeed. I bought a new carburetor and with the pass exactly the same thing. I am grateful about every help. Lg