My buddy is bringing over his older (i think pre-97) 2hp honda tomorrow for us to work on. It ran great last fall but now only runs on choke. Take it off choke or try to give it gas and it dies. I think it need a carb cleaning. Is this complicated on the smaller four strokes carbs? I routinely clean 2 stroke carbs but am in unchartered terriorty with the four stroke. Any advice is greatly appeciated!