What you describe are common problems gas carts have and the cure is checking and adjusting the components that can cause these faults.
I know you will not be the mechanic for the cure but these are most of the things that will be looked at by a good tech. Fuel tank, fuel filters, fuel lines , fuel pump, carb adjustments.
On the electric side, spark plug, wire , micro switch adjustments , coil , rev limiter.
As you can see and I'm sure you agree the testing for this one cylinder engine is basic and complex at the same time and it could be a combination of more than one thing. I don't know who has tried to repair but sometimes they need more time to get it corrected.
If that fails we can help.
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