sounds like a vacuum leak and/or a bad carburetor. Might want to also check the valve clearance again and make sure the camshaft timing is spot on. Simplified the carburetor has four modes...cold start, idle, mid-range and power. I'd be checking the cold start enrichment and idle speed/fuel mixture adj. If that doesn't get it running right try cleaning the carb and if that doesn't work ... new carburetors are cheap for GY6s.
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