I can tell you from my extensive history of experience building and maintaining GY6's in a fleet of scooters these motors are highly sensitive to valve adjustments. .003 on the intake and .004 exhaust. Also I will assume you have made sure the carb is clean. If your mixture screw is capped off drill it out and seat the mixture screw then back it out 2.5 turns. Double check all your grounds have bare metal contact and you have a fully charged, preferably new battery. Make sure you have a good spark plug in her as well. That should get you a good start. The next step would be looking at the coil gap as well as checking contacts on said coil as well as on the cdi.
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