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Hello and welcome to just answer I value your input to my questions so I may help you better. This is a carburetor engine I presume? It sounds like that carb needs to be either replaced or rebuilt. What you can do is use a can of fuel system cleaner in the fuel tank and use a carb cleaner to spray in the opening while running they tend to varnish and gum up over time.Hope this gives you a start to solve your problem and I fyou require more help let me know.
As you can see they are quite complicated with many ports and valves , unlike the older ones.