My gy6 motor only had an o-ring style gasket on the valve cover.
As far as it running bad when it's hot, I would make sure your automatic choke is working. If it isn't working it will cause the buggy to run very rich.
A quick check is to take the auto choke off and apply 12 volts to it, it should extend slowly. This can take a few minutes.
In the picture you posted the auto choke is the thing on your carb with the green and yellow wires.
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