Is the electric choke hooked up and or adjusted right?
That would cause it to start well then foul out plugs after a short distance.
Have your husband start the engine and run it for a few (3 or so) minutes, then turn off the engine and take off the air filter located on the carb.
Look at the top choke plate, if it is still closed, loosen (DO NOT REMOVE) the 3 screws holding the electric choke element (the thing with the wire hooked to in on the top right side of the carb) (at least it is supposed to have a wire on it) and adjust it till it opens.
That might just be your problem. The carb will not be adjusted correctly out of the box.
Just a thought,
KC
