Hi Rich - I would strip the carb, run carb cleaner through all the orifices and then rebuild with a new diaphragm/needle/filter screen kit. I can send you links to how it is done if you fancy having a go. It's all quite straightforward if you mark everything up and take photographs of where all the bits go.
But first, make surre there is nothing blocking airflow to the fins thus causing the engine to overheat.
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