Re: ez go not wanting to go...
The missing screw is the slow running jet. Without it the engine will suck in way too much air and you will need to choke the engine to redress the balance. To be frank I would cut my losses and just replace the carburetor. In the post you linked to you will see that I recommended a certain vendor but I understand that they have recently been bought out by one of the big guys. I would peruse the sponsors here and look for a target price of ~$100
With regard to the belt and the cart moving, is the clutch on the engine fully open and the clutch on the axle tight shut? It is also possible that someone has fitted a shorter belt as this is a common ruse to increase low end torque. Whilst you are testing I would wind the belt off or jack up the rear to reduce the strain on the starter.
Dave
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