Smell the fuel to see if it still resembles fresh gasohol smell. If it smells “old” drain the carb and tank and put in fresh gas.
If the gas smells reasonable, or you have drained and refilled give it a whirl.
If it starts and runs but has a case of the sniffles, Sea Foam fuel treatment generously administered to the fresh gas you put in the tank can rescue the situation by clearing deposits in the carb.
Warm him up and then let it work on a load like an electric heater. Remove the load so it idles down running on the idle jet which is smaller, out the load back on, do this a few times till it smooths out then let it work until it has burned a gallon of the treated gas or more.
