Suggest you Notify Moderator and ask that this thread move to Tech Issues. Several genset experts there. And, please Edit to include Model and Spec Numbers. If you post the full Model Number, that Spec will be the last character.
Meanwhile, are you getting good fuel flow to it? A porous rubber hose between tank and fuel pump would add air to the liquid gasoline, a weak pump of course wouldn't provide full flow. Neither would a clogged filter. the 4KY series usually suffers from carb problems but we've had a few fuel pump cases recently.