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Hello my name is ***** ***** I will assist you. The problem you have is due to a blocked slow running jet in the carburetors. What you need to do is to remove the carbs and get them cleaned. To do this you would need to remove the carbs and open their bowls. The remove all rubber components ad soak the carb and bowl into carb cleaner. After a couple of hours, blow everything with compressed air and reassemble everything back. Ideally take photos if you are not that much familiar with this operation. After reassembling everything it should run normally.
If you have further questions just let me know.