check the float setting in your carb bowl. from what you describe, it sounds like the float is set to low and won't allow the carb to fill with enough fuel.
Remove the carb, then remove the float bowl. hold the carb up side down and hold it level . Sight across the edge where the rubber gasket sets. The float should be level with the edge. If the float is tilted one way or another, there is the tab and hook that connects it to the needle valve. carfully bend the tab to set the float straight. Do not push down on the needle valve! Remove the float to make adjustments by sliding the pin out that holds the float in place. It's very simple to do, just observe how it all goes together before removing the pin. The parts, [4 pieces] all are very small so do this over a clean towel so nothing gets lost.
There are tons of pics all over the web showing this. do a search for a Kehin 24mm. the carb you have is probably a clone but the settings and parts are the same.
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