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Thank you for allowing me to assist you, my name is Joe and I will be happy to assist you with your concern today.
Start by checking compression, next remove gas fill cap and see if it then runs better, if so the vent line/tube is clogged. Next would be to have the carbs rechecked, the carb has an internal filter in it and they must be correctly rebuilt as well as doing the fuel pump at the same time, the pop off pressure would then need to be checked and correct hi/low settings made.
Thank you!- Joe
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