You have to understand that the 160 is the bottom of the line Honda engine. Also, it, like most others, struggles to get enough gas due to EPA restrictions. Also, I'll bet it has something to do with the workmanship and the Chinese parts that everyone, even Honda, use to make a cheaper product. I wonder if they leave a little burr inside the jet during manufacturing (sometimes) that catches small stuff that would normally pass right through. I have to use miniature drill bits sometimes to get them unblocked. A torch tip cleaner won't touch it.
TIP: Be very careful if you take the carb off and decide to break off the small tab that keeps the air screw from being adjusted. The whole screw can bust off...speaking of Chinese parts.