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Hello, my name is***** will assist you.
Make sure that you are getting a good supply of fuel from the tank to the engine. If you have a separate fuel tank that you could run off of, and it ran better, you have an issue with either the hose to the engine or inside the boats fuel tank, If it runs the same, Make sure that the fuel filter is clean and there is no water in the fuel.
The base setting for the engine would be around 1 1/2 turns from a light seat on the mixture needles. Let me know how the next test goes.