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Hello my name is ***** ***** I will assist you. from what you are describing, the symptoms are of fuel starvation. The carbs and fuel pump need to be rebuilt. To do this you would need to get a rebuilding kit from your local agent first. Then remove the carbs and fuel pump and carefully dismantle. Soak in carb cleaner for a couple of hours and reassemble them using the new parts from the kit. Reassemble them in place and you should run ok.
If you require further assistance let me know.