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This can be caused from several things. Low oil volume, a dirty carb or fuel pump that is failing. If this has been sitting any length of time and you didn't have a fuel stabilizer in the fuel has gone bad and some debris is left. Failing fuel pumps have a run time of about 20 minutes so that is suspect. I have had several lately where that was the cause. Check the oil levle first and be sure it isn't low and then move to the other possible causes. Hope that proves helpful here. Please let me know if you don't have the Service Manual that would help you here. And include your actual model number of this set when you respond. All follow ups are included in our fee.
Just checking back in to see if you were able to get this resolved or do you still need some additional input from me?