Wont run right. (video added/ MORE INFO)

Location
MD, US
I have a 1990 kawi 650sx. it usually works fine cold.but after a few min it starts sputtering and you have to let it idle for a few min to get it to work again. And even then sometimes it still won't work.

oil block off plate
mixed gas 50:1
crankcase drain blocked off
mariner pipe and box

the motor is from a JF 650 and so is the carb.
 
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