Clean the original carb and reinstall!!! No Chinese junk! The original carb is jetted for that engine.
On to your video. When you open it up u can hear the carburetor you shouldn't hear it like that. Replace original foam filter. Check for air leaks? Carburetor gasket, reed valve gasket, base gasket, case gasket, and exhaust. I remember my 1st fa drove me nuts doing the same thing! This is what mine was check all your vacuum lines. I had little cracks in mine just enough to be way lean. Your engine is lean not rich!