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1978 cb750 four leaking gas oil mix

Sounds rough. I can't really tell what you're trying to show in the video. If it's leaking gas you need to go through your carbs. Check the float and needle and seat in each carb.
 
definitely is missing on at least one cylinder. Have you gone through the carbs at all? Checked points? plugs? valve clearances? compression? The leak is more than likely fuel overflowing and washing some dirt and oil off the cases.
 
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